Getting ASP.NET Core 2.0 Final error with .NET Core 2.0: Unhandled Exception: System.IO.FileLoadException: Could not load file or assembly 'System.Diagnostics.DiagnosticSource

Steps to reproduce

Create a ASP.NET Core 2.0 (final) project or any project with: <ItemGroup> <PackageReference Include="Microsoft.AspNetCore.All" Version="2.0.0" /> </ItemGroup>

dotnet restore dotnet run

Expected behavior

Run without errors or warnings

Actual behavior

Dotnet run results in the error below:

dotnet run: /usr/local/share/dotnet/sdk/2.0.0-preview2-006497/Microsoft.Common.CurrentVersion.targets(1984,5): 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. [/Users/guilherme/Desktop/CatalogWeb/CatalogWeb.csproj]

Unhandled Exception: System.IO.FileLoadException: Could not load file or assembly ‘System.Diagnostics.DiagnosticSource, Version=4.0.2.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51’. The located assembly’s manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040) at Microsoft.AspNetCore.Hosting.WebHostBuilder.BuildCommonServices(AggregateException& hostingStartupErrors) at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build() at CatalogWeb.Program.BuildWebHost(String[] args) in /Users/guilherme/Desktop/CatalogWeb/Program.cs:line 21 at CatalogWeb.Program.Main(String[] args) in /Users/guilherme/Desktop/CatalogWeb/Program.cs:line 17

Environment data

dotnet --info output: .NET Command Line Tools (2.0.0-preview2-006497)

Product Information: Version: 2.0.0-preview2-006497 Commit SHA-1 hash: 06a2093335

Runtime Environment: OS Name: Mac OS X OS Version: 10.13 OS Platform: Darwin RID: osx.10.12-x64 Base Path: /usr/local/share/dotnet/sdk/2.0.0-preview2-006497/

Microsoft .NET Core Shared Framework Host

Version : 2.0.0-preview2-25407-01 Build : 40c565230930ead58a50719c0ec799df77bddee9

[guidefreitas]

The issue was solved using the latest .NET Core 2.0 release (final - https://download.microsoft.com/download/0/F/D/0FD852A4-7EA1-4E2A-983A-0484AC19B92C/dotnet-sdk-2.0.0-osx-x64.pkg).

[d-saravanan]

Updating to Visual Studio 2017, 15.4, Preview 1 and installing the dotnet core 2.0 final release enabled me to get rid of this error and i am able to run the app now. Thanks 👍