Build Error

I’ve downloaded the source through abp.com/template (Asp.Net MVC 5, Multi Page Web App, Entity Framework) with including module-zero checked and stable checked. After download when I tried to build SMOKE.Web (startup project) receiving following errors without changing any stuff:

1>------ Build started: Project: SMOKE.Core, Configuration: Debug Any CPU ------ 1> Restoring NuGet packages... 1> To prevent NuGet from downloading packages during build, open the Visual Studio Options dialog, click on the Package Manager node and uncheck 'Allow NuGet to download missing packages'. 1> Feeds used: 1> C:\.nuget\packages\ 1> https://api.nuget.org/v3/index.json 1> C:\SA\NuGet-Packages 1> C:\Program Files (x86)\Microsoft SDKs\NuGetPackages\ 1> 1> All packages listed in C:\3.1.4\src\SMOKE.Core\packages.config are already installed. 1>C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\15.0\Bin\Microsoft.Common.CurrentVersion.targets(1964,5): warning MSB3277: Found conflicts between different versions of the same dependent assembly that could not be resolved. These reference conflicts are listed in the build log when log verbosity is set to detailed. 1>C:\3.1.4\src\SMOKE.Core\Authorization\SMOKEAuthorizationProvider.cs(7,47,7,68): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Configuration\AppSettingProvider.cs(6,39,6,54): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\SMOKEAuthorizationProvider.cs(9,45,9,73): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Configuration\AppSettingProvider.cs(8,78,8,110): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Configuration\AppSettingProvider.cs(8,25,8,55): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Configuration\AppSettingProvider.cs(8,37,8,54): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\SMOKEAuthorizationProvider.cs(16,24,16,42): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Configuration\AppSettingProvider.cs(8,56,8,77): error CS0508: 'AppSettingProvider.GetSettingDefinitions(SettingDefinitionProviderContext)': return type must be 'IEnumerable<SettingDefinition>' to match overridden member 'SettingProvider.GetSettingDefinitions(SettingDefinitionProviderContext)' 1>C:\3.1.4\src\SMOKE.Core\Configuration\AppSettingProvider.cs(8,56,8,77): error CS0012: The type 'IEnumerable<>' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\SMOKECoreModule.cs(15,6,15,15): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\SMOKECoreModule.cs(15,6,15,15): error CS0012: The type 'Attribute' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\SMOKECoreModule.cs(15,23,15,40): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\SMOKECoreModule.cs(15,6,15,42): error CS0012: The type 'Type' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\SMOKECoreModule.cs(16,36,16,45): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Features\FeatureValueStore.cs(11,38,11,72): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Editions\EditionManager.cs(7,35,7,52): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\MultiTenancy\Tenant.cs(6,27,6,42): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\MultiTenancy\TenantManager.cs(9,34,9,64): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\User.cs(8,25,8,38): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Roles\Role.cs(7,25,7,38): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Editions\EditionManager.cs(12,13,12,33): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Editions\EditionManager.cs(12,25,12,32): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Editions\EditionManager.cs(13,13,13,38): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\MultiTenancy\TenantManager.cs(12,13,12,32): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\MultiTenancy\TenantManager.cs(12,25,12,31): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\MultiTenancy\TenantManager.cs(13,13,13,52): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\MultiTenancy\TenantManager.cs(13,25,13,45): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\MultiTenancy\TenantManager.cs(14,13,14,27): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\MultiTenancy\TenantManager.cs(15,13,15,38): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Features\FeatureValueStore.cs(14,13,14,26): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Features\FeatureValueStore.cs(15,13,15,52): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Features\FeatureValueStore.cs(15,25,15,45): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Features\FeatureValueStore.cs(16,13,16,32): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Features\FeatureValueStore.cs(16,25,16,31): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Features\FeatureValueStore.cs(17,13,17,53): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Features\FeatureValueStore.cs(17,25,17,46): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Features\FeatureValueStore.cs(18,13,18,28): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Features\FeatureValueStore.cs(19,13,19,31): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserRegistrationManager.cs(16,44,16,57): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserRegistrationManager.cs(18,16,18,27): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\LoginManager.cs(20,25,20,31): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\LoginManager.cs(23,25,23,41): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Roles\RoleStore.cs(11,25,11,29): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Roles\RoleStore.cs(12,25,12,33): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Roles\RoleStore.cs(13,25,13,46): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserRegistrationManager.cs(36,22,36,32): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserRegistrationManager.cs(36,27,36,31): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserRegistrationManager.cs(75,23,75,35): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserRegistrationManager.cs(75,28,75,34): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Roles\Role.cs(27,10,27,19): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserRegistrationManager.cs(85,23,85,35): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserRegistrationManager.cs(85,28,85,34): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserRegistrationManager.cs(101,44,101,58): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserRegistrationManager.cs(20,26,20,39): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserRegistrationManager.cs(21,26,21,37): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserRegistrationManager.cs(22,26,22,37): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserRegistrationManager.cs(25,13,25,26): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserRegistrationManager.cs(26,13,26,24): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserRegistrationManager.cs(27,13,27,24): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\User.cs(17,23,17,27): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserStore.cs(11,25,11,29): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserStore.cs(12,25,12,34): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserStore.cs(13,25,13,33): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserStore.cs(14,25,14,29): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserStore.cs(15,25,15,46): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserStore.cs(17,25,17,34): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserManager.cs(22,25,22,41): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 1>C:\3.1.4\src\SMOKE.Core\Authorization\Users\UserManager.cs(23,25,23,45): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 2>------ Build started: Project: SMOKE.Application, Configuration: Debug Any CPU ------ 3>------ Build started: Project: SMOKE.EntityFramework, Configuration: Debug Any CPU ------ 2> Restoring NuGet packages... 2> To prevent NuGet from downloading packages during build, open the Visual Studio Options dialog, click on the Package Manager node and uncheck 'Allow NuGet to download missing packages'. 2> Feeds used: 2> C:\.nuget\packages\ 2> https://api.nuget.org/v3/index.json 2> C:\SA\NuGet-Packages 2> C:\Program Files (x86)\Microsoft SDKs\NuGetPackages\ 2> 2> All packages listed in C:\3.1.4\src\SMOKE.Application\packages.config are already installed. 2>C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\15.0\Bin\Microsoft.Common.CurrentVersion.targets(1964,5): warning MSB3277: Found conflicts between different versions of the same dependent assembly that could not be resolved. These reference conflicts are listed in the build log when log verbosity is set to detailed. 2>CSC : error CS0006: Metadata file 'C:\3.1.4\src\SMOKE.Core\bin\Debug\SMOKE.Core.dll' could not be found 4>------ Build started: Project: SMOKE.WebApi, Configuration: Debug Any CPU ------ 3> Restoring NuGet packages... 3> To prevent NuGet from downloading packages during build, open the Visual Studio Options dialog, click on the Package Manager node and uncheck 'Allow NuGet to download missing packages'. 3> Feeds used: 3> C:\.nuget\packages\ 3> https://api.nuget.org/v3/index.json 3> C:\SA\NuGet-Packages 3> C:\Program Files (x86)\Microsoft SDKs\NuGetPackages\ 3> 3> All packages listed in C:\3.1.4\src\SMOKE.EntityFramework\packages.config are already installed. 3>C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\15.0\Bin\Microsoft.Common.CurrentVersion.targets(1964,5): warning MSB3277: Found conflicts between different versions of the same dependent assembly that could not be resolved. These reference conflicts are listed in the build log when log verbosity is set to detailed. 3>CSC : error CS0006: Metadata file 'C:\3.1.4\src\SMOKE.Core\bin\Debug\SMOKE.Core.dll' could not be found 4> Restoring NuGet packages... 4> To prevent NuGet from downloading packages during build, open the Visual Studio Options dialog, click on the Package Manager node and uncheck 'Allow NuGet to download missing packages'. 4> Feeds used: 4> C:\.nuget\packages\ 4> https://api.nuget.org/v3/index.json 4> C:\SA\NuGet-Packages 4> C:\Program Files (x86)\Microsoft SDKs\NuGetPackages\ 4> 4> All packages listed in C:\3.1.4\src\SMOKE.WebApi\packages.config are already installed. 4>C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\15.0\Bin\Microsoft.Common.CurrentVersion.targets(1964,5): warning MSB3277: Found conflicts between different versions of the same dependent assembly that could not be resolved. These reference conflicts are listed in the build log when log verbosity is set to detailed. 4>CSC : error CS0006: Metadata file 'C:\3.1.4\src\SMOKE.Application\bin\Debug\SMOKE.Application.dll' could not be found 4>CSC : error CS0006: Metadata file 'C:\3.1.4\src\SMOKE.Core\bin\Debug\SMOKE.Core.dll' could not be found 5>------ Build started: Project: SMOKE.Web, Configuration: Debug Any CPU ------ 5> Restoring NuGet packages... 5> To prevent NuGet from downloading packages during build, open the Visual Studio Options dialog, click on the Package Manager node and uncheck 'Allow NuGet to download missing packages'. 5> Feeds used: 5> C:\.nuget\packages\ 5> https://api.nuget.org/v3/index.json 5> C:\SA\NuGet-Packages 5> C:\Program Files (x86)\Microsoft SDKs\NuGetPackages\ 5> 5> All packages listed in C:\3.1.4\src\SMOKE.Web\packages.config are already installed. 5>C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\15.0\Bin\Microsoft.Common.CurrentVersion.targets(1964,5): warning MSB3245: Could not resolve this reference. Could not locate the assembly "Microsoft.Owin.Security.Google, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL". Check to make sure the assembly exists on disk. If this reference is required by your code, you may get compilation errors. 5>C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\15.0\Bin\Microsoft.Common.CurrentVersion.targets(1964,5): warning MSB3245: Could not resolve this reference. Could not locate the assembly "Microsoft.Owin.Security.Twitter, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL". Check to make sure the assembly exists on disk. If this reference is required by your code, you may get compilation errors. 5>C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\15.0\Bin\Microsoft.Common.CurrentVersion.targets(1964,5): warning MSB3277: Found conflicts between different versions of the same dependent assembly that could not be resolved. These reference conflicts are listed in the build log when log verbosity is set to detailed. 5>CSC : error CS0006: Metadata file 'C:\3.1.4\src\SMOKE.Application\bin\Debug\SMOKE.Application.dll' could not be found 5>CSC : error CS0006: Metadata file 'C:\3.1.4\src\SMOKE.Core\bin\Debug\SMOKE.Core.dll' could not be found 5>CSC : error CS0006: Metadata file 'C:\3.1.4\src\SMOKE.EntityFramework\bin\Debug\SMOKE.EntityFramework.dll' could not be found 5>CSC : error CS0006: Metadata file 'C:\3.1.4\src\SMOKE.WebApi\bin\Debug\SMOKE.WebApi.dll' could not be found ========== Build: 0 succeeded, 5 failed, 0 up-to-date, 0 skipped ==========

[acjh]

In the Package Manager Console, run the Install-Package EntityFramework command.

[rmsohaila]

Bingo, working now. Thanks.