Project fails to load, SDK 'Microsoft.NET.Sdk.Razor' not found

I know there are other issues with the same behavior but they mostly refer to MacOS and the fix seems to be to install an up to date Mono. The issue I am experiencing happens on Linux, with the latest version of Mono installed.

Environment data

dotnet --info output:

.NET Core SDK (reflecting any global.json):
 Version:   2.1.403
 Commit:    04e15494b6

Runtime Environment:
 OS Name:     debian
 OS Version:  
 OS Platform: Linux
 RID:         debian-x64
 Base Path:   /usr/share/dotnet/sdk/2.1.403/

Host (useful for support):
  Version: 2.1.5
  Commit:  290303f510

.NET Core SDKs installed:
  2.1.403 [/usr/share/dotnet/sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.All 2.1.5 [/usr/share/dotnet/shared/Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.5 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.5 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

VS Code version:

Version: 1.28.1
Commit: 3368db6750222d319c851f6d90eb619d886e08f5
Date: 2018-10-11T18:09:20.566Z
Electron: 2.0.9
Chrome: 61.0.3163.100
Node.js: 8.9.3
V8: 6.1.534.41
Architecture: x64

C# Extension version:

1.16.2

Mono version:

Mono JIT compiler version 5.16.0.179 (tarball Thu Oct  4 10:24:32 UTC 2018)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
	TLS:           __thread
	SIGSEGV:       altstack
	Notifications: epoll
	Architecture:  amd64
	Disabled:      none
	Misc:          softdebug 
	Interpreter:   yes
	LLVM:          yes(3.6.0svn-mono-/)
	GC:            sgen (concurrent by default)

Steps to reproduce

Just load any project with latest version on Linux. The exception is always the same:

Starting OmniSharp server at 10/12/2018, 10:02:57 AM
    Target: /home/fog/Customers/ventana/yes3/Yes.sln

OmniSharp server started with Mono 5.16.0.
    Path: /home/fog/.vscode/extensions/ms-vscode.csharp-1.16.2/.omnisharp/1.32.5/omnisharp/OmniSharp.exe
    PID: 9601

[info]: OmniSharp.Stdio.Host
        Starting OmniSharp on debian 0.0 (x64)
[info]: OmniSharp.Services.DotNetCliService
        DotNetPath set to dotnet
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Located 2 MSBuild instance(s)
            1: Mono 15.0 - "/usr/lib/mono/msbuild/15.0/bin"
            2: StandAlone 15.0 - "/home/fog/.vscode/extensions/ms-vscode.csharp-1.16.2/.omnisharp/1.32.5/omnisharp/msbuild/15.0/Bin"
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Registered MSBuild instance: Mono 15.0 - "/usr/lib/mono/msbuild/15.0/bin"
            CscToolPath = /home/fog/.vscode/extensions/ms-vscode.csharp-1.16.2/.omnisharp/1.32.5/omnisharp/msbuild/15.0/Bin/Roslyn
            CscToolExe = csc.exe
[info]: OmniSharp.Cake.CakeProjectSystem
        Detecting Cake files in '/home/fog/Customers/ventana/yes3'.
[info]: OmniSharp.Cake.CakeProjectSystem
        Could not find any Cake files
[info]: OmniSharp.WorkspaceInitializer
        Project system 'OmniSharp.DotNet.DotNetProjectSystem' is disabled in the configuration.
[info]: OmniSharp.MSBuild.ProjectSystem
        Detecting projects in '/home/fog/Customers/ventana/yes3/Yes.sln'.
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for '/home/fog/Customers/ventana/yes3/backoffice/Backoffice.csproj'
[info]: OmniSharp.Script.ScriptProjectSystem
        Detecting CSX files in '/home/fog/Customers/ventana/yes3'.
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: /home/fog/Customers/ventana/yes3/backoffice/Backoffice.csproj
[info]: OmniSharp.Script.ScriptProjectSystem
        Could not find any CSX files
[info]: OmniSharp.WorkspaceInitializer
        Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.CSharpWorkspaceOptionsProvider
[info]: OmniSharp.WorkspaceInitializer
        Configuration finished.
[info]: OmniSharp.Stdio.Host
        Omnisharp server running using Stdio at location '/home/fog/Customers/ventana/yes3' on host 9448.
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file '/home/fog/Customers/ventana/yes3/backoffice/Backoffice.csproj'.
/home/fog/Customers/ventana/yes3/backoffice/Backoffice.csproj(1,1)
Microsoft.Build.Exceptions.InvalidProjectFileException: The SDK 'Microsoft.NET.Sdk.Razor' specified could not be found.  /usr/lib/mono/msbuild/15.0/bin/Sdks/Microsoft.NET.Sdk.Web/Sdk/Sdk.props
  at Microsoft.Build.Shared.ProjectErrorUtilities.ThrowInvalidProject (System.String errorSubCategoryResourceName, Microsoft.Build.Shared.IElementLocation elementLocation, System.String resourceName, System.Object[] args) [0x00040] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at Microsoft.Build.Shared.ProjectErrorUtilities.VerifyThrowInvalidProject[T1] (System.Boolean condition, System.String errorSubCategoryResourceName, Microsoft.Build.Shared.IElementLocation elementLocation, System.String resourceName, T1 arg0) [0x00003] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at Microsoft.Build.Shared.ProjectErrorUtilities.ThrowInvalidProject[T1] (Microsoft.Build.Shared.IElementLocation elementLocation, System.String resourceName, T1 arg0) [0x00000] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at Microsoft.Build.Evaluation.Evaluator`4[P,I,M,D].ExpandAndLoadImportsFromUnescapedImportExpressionConditioned (System.String directoryOfImportingFile, Microsoft.Build.Construction.ProjectImportElement importElement, System.Collections.Generic.List`1[Microsoft.Build.Construction.ProjectRootElement]& projects, Microsoft.Build.BackEnd.SdkResolution.SdkResult& sdkResult, System.Boolean throwOnFileNotExistsError) [0x0024e] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at Microsoft.Build.Evaluation.Evaluator`4[P,I,M,D].ExpandAndLoadImports (System.String directoryOfImportingFile, Microsoft.Build.Construction.ProjectImportElement importElement, Microsoft.Build.BackEnd.SdkResolution.SdkResult& sdkResult) [0x00027] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at Microsoft.Build.Evaluation.Evaluator`4[P,I,M,D].EvaluateImportElement (System.String directoryOfImportingFile, Microsoft.Build.Construction.ProjectImportElement importElement) [0x0000d] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at Microsoft.Build.Evaluation.Evaluator`4[P,I,M,D].PerformDepthFirstPass (Microsoft.Build.Construction.ProjectRootElement currentProjectOrImport) [0x00209] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at Microsoft.Build.Evaluation.Evaluator`4[P,I,M,D].EvaluateImportElement (System.String directoryOfImportingFile, Microsoft.Build.Construction.ProjectImportElement importElement) [0x00040] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at Microsoft.Build.Evaluation.Evaluator`4[P,I,M,D].PerformDepthFirstPass (Microsoft.Build.Construction.ProjectRootElement currentProjectOrImport) [0x000e6] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at Microsoft.Build.Evaluation.Evaluator`4[P,I,M,D].Evaluate (Microsoft.Build.BackEnd.Logging.ILoggingService loggingService, Microsoft.Build.Framework.BuildEventContext buildEventContext) [0x00103] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at Microsoft.Build.Evaluation.Evaluator`4[P,I,M,D].Evaluate (Microsoft.Build.Evaluation.IEvaluatorData`4[P,I,M,D] data, Microsoft.Build.Construction.ProjectRootElement root, Microsoft.Build.Evaluation.ProjectLoadSettings loadSettings, System.Int32 maxNodeCount, Microsoft.Build.Collections.PropertyDictionary`1[T] environmentProperties, Microsoft.Build.BackEnd.Logging.ILoggingService loggingService, Microsoft.Build.Evaluation.IItemFactory`2[S,T] itemFactory, Microsoft.Build.Evaluation.IToolsetProvider toolsetProvider, Microsoft.Build.Evaluation.ProjectRootElementCache projectRootElementCache, Microsoft.Build.Framework.BuildEventContext buildEventContext, Microsoft.Build.Execution.ProjectInstance projectInstanceIfAnyForDebuggerOnly, Microsoft.Build.BackEnd.SdkResolution.ISdkResolverService sdkResolverService, System.Int32 submissionId, Microsoft.Build.Evaluation.Context.EvaluationContext evaluationContext) [0x0001a] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at Microsoft.Build.Evaluation.Project.Reevaluate (Microsoft.Build.BackEnd.Logging.ILoggingService loggingServiceForEvaluation, Microsoft.Build.Evaluation.ProjectLoadSettings loadSettings) [0x0004c] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at Microsoft.Build.Evaluation.Project.ReevaluateIfNecessary (Microsoft.Build.BackEnd.Logging.ILoggingService loggingServiceForEvaluation, Microsoft.Build.Evaluation.ProjectLoadSettings loadSettings) [0x00034] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at Microsoft.Build.Evaluation.Project.ReevaluateIfNecessary (Microsoft.Build.BackEnd.Logging.ILoggingService loggingServiceForEvaluation) [0x00000] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at Microsoft.Build.Evaluation.Project.ReevaluateIfNecessary (Microsoft.Build.Evaluation.Context.EvaluationContext evaluationContext) [0x00023] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at Microsoft.Build.Evaluation.Project.Initialize (System.Collections.Generic.IDictionary`2[TKey,TValue] globalProperties, System.String toolsVersion, System.String subToolsetVersion, Microsoft.Build.Evaluation.ProjectLoadSettings loadSettings, Microsoft.Build.Evaluation.Context.EvaluationContext evaluationContext) [0x00126] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at Microsoft.Build.Evaluation.Project..ctor (System.String projectFile, System.Collections.Generic.IDictionary`2[TKey,TValue] globalProperties, System.String toolsVersion, System.String subToolsetVersion, Microsoft.Build.Evaluation.ProjectCollection projectCollection, Microsoft.Build.Evaluation.ProjectLoadSettings loadSettings, Microsoft.Build.Evaluation.Context.EvaluationContext evaluationContext) [0x0009e] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at Microsoft.Build.Evaluation.Project..ctor (System.String projectFile, System.Collections.Generic.IDictionary`2[TKey,TValue] globalProperties, System.String toolsVersion, System.String subToolsetVersion, Microsoft.Build.Evaluation.ProjectCollection projectCollection, Microsoft.Build.Evaluation.ProjectLoadSettings loadSettings) [0x00000] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at Microsoft.Build.Evaluation.Project..ctor (System.String projectFile, System.Collections.Generic.IDictionary`2[TKey,TValue] globalProperties, System.String toolsVersion, Microsoft.Build.Evaluation.ProjectCollection projectCollection, Microsoft.Build.Evaluation.ProjectLoadSettings loadSettings) [0x00000] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at Microsoft.Build.Evaluation.Project..ctor (System.String projectFile, System.Collections.Generic.IDictionary`2[TKey,TValue] globalProperties, System.String toolsVersion, Microsoft.Build.Evaluation.ProjectCollection projectCollection) [0x00000] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at Microsoft.Build.Evaluation.ProjectCollection.LoadProject (System.String fileName, System.Collections.Generic.IDictionary`2[TKey,TValue] globalProperties, System.String toolsVersion) [0x000f7] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at Microsoft.Build.Evaluation.ProjectCollection.LoadProject (System.String fileName, System.String toolsVersion) [0x00000] in <63bca7756d124ea392a81ca1b2d26b9c>:0 
  at OmniSharp.MSBuild.ProjectLoader.EvaluateProjectFileCore (System.String filePath) [0x0003e] in <99f3a3b619ce4010a7d6d489ffd5bcf1>:0 
  at OmniSharp.MSBuild.ProjectLoader.BuildProject (System.String filePath) [0x0000d] in <99f3a3b619ce4010a7d6d489ffd5bcf1>:0 
  at OmniSharp.MSBuild.ProjectFile.ProjectFileInfo.Load (System.String filePath, OmniSharp.MSBuild.ProjectLoader loader) [0x00015] in <99f3a3b619ce4010a7d6d489ffd5bcf1>:0 
  at OmniSharp.MSBuild.ProjectManager+<>c__DisplayClass25_0.<LoadProject>b__0 () [0x00000] in <99f3a3b619ce4010a7d6d489ffd5bcf1>:0 
  at (wrapper delegate-invoke) System.Func`1[System.ValueTuple`3[OmniSharp.MSBuild.ProjectFile.ProjectFileInfo,System.Collections.Immutable.ImmutableArray`1[OmniSharp.MSBuild.Logging.MSBuildDiagnostic],OmniSharp.MSBuild.Notification.ProjectLoadedEventArgs]].invoke_TResult()
  at OmniSharp.MSBuild.ProjectManager.LoadOrReloadProject (System.String projectFilePath, System.Func`1[TResult] loader) [0x0001b] in <99f3a3b619ce4010a7d6d489ffd5bcf1>:0 

[fail]: OmniSharp.MSBuild.ProjectManager
        Attemped to update project that is not loaded: /home/fog/Customers/ventana/yes3/backoffice/Backoffice.csproj

[arlomba]

I had a similar issue, but solved it. Try adding this to your PATH variable (.bashrc, .zshrc…):

MSBuildSDKsPath=/path/to/dotnet/sdk
# export MSBuildSDKsPath=/opt/dotnet/sdk/2.1.403/Sdks
# export PATH=$MSBuildSDKsPath:$PATH

I’m on Arch, so you’ll probably need to modify the path.

[arlomba]

A better solution would be:

export MSBuildSDKsPath=/opt/dotnet/sdk/$(dotnet --version)/Sdks

This way you don’t have to update SDK’s version.