The "Microsoft.AspNetCore.Razor.Tasks.DiscoverDefaultScopedCssItems" task could not be loaded

[michaelbarkdoll]

Hi, just updated dotnet to 5.0.102 and now the follow error occurs loading this extension:
fail: OmniSharp.MSBuild.ProjectLoader
The "Microsoft.AspNetCore.Razor.Tasks.DiscoverDefaultScopedCssItems" task could not be loaded from the assembly /usr/lib64/dotnet/sdk/5.0.102/Sdks/Microsoft.NET.Sdk.Razor/build/netstandard2.0/../../tasks/net46/Microsoft.NET.Sdk.Razor.Tasks.dll. Invalid Image Confirm that the declaration is correct, that the assembly and all its dependencies are available, and that the task contains a public class that implements Microsoft.Build.Framework.ITask.

Any help fixing the issue is appreciated.

OmniSharp log

Starting OmniSharp server at 1/22/2021, 12:05:48 PM
Target: /home/cisadmin/sample-dotnet-projec1/test

OmniSharp server started.
Path: /home/cisadmin/.vscode/extensions/ms-dotnettools.csharp-1.23.8/.omnisharp/1.37.5/run
PID: 64366

Starting OmniSharp on centos 8.0 (x64)
info: OmniSharp.Services.DotNetCliService
DotNetPath set to dotnet
info: OmniSharp.MSBuild.Discovery.MSBuildLocator
Located 1 MSBuild instance(s)
1: StandAlone 16.8.0 - "/home/cisadmin/.vscode/extensions/ms-dotnettools.csharp-1.23.8/.omnisharp/1.37.5/omnisharp/.msbuild/Current/Bin"
info: OmniSharp.MSBuild.Discovery.MSBuildLocator
MSBUILD_EXE_PATH environment variable set to '/home/cisadmin/.vscode/extensions/ms-dotnettools.csharp-1.23.8/.omnisharp/1.37.5/omnisharp/.msbuild/Current/Bin/MSBuild.exe'
info: OmniSharp.MSBuild.Discovery.MSBuildLocator
Registered MSBuild instance: StandAlone 16.8.0 - "/home/cisadmin/.vscode/extensions/ms-dotnettools.csharp-1.23.8/.omnisharp/1.37.5/omnisharp/.msbuild/Current/Bin"
CscToolExe = csc.exe
MSBuildToolsPath = /home/cisadmin/.vscode/extensions/ms-dotnettools.csharp-1.23.8/.omnisharp/1.37.5/omnisharp/.msbuild/Current/Bin
CscToolPath = /home/cisadmin/.vscode/extensions/ms-dotnettools.csharp-1.23.8/.omnisharp/1.37.5/omnisharp/.msbuild/Current/Bin/Roslyn
BypassFrameworkInstallChecks = true
MSBuildExtensionsPath = /home/cisadmin/.vscode/extensions/ms-dotnettools.csharp-1.23.8/.omnisharp/1.37.5/omnisharp/.msbuild
info: OmniSharp.Cake.CakeProjectSystem
Detecting Cake files in '/home/cisadmin/sample-dotnet-projec1/test'.
info: OmniSharp.Cake.CakeProjectSystem
Could not find any Cake files
info: OmniSharp.MSBuild.ProjectSystem
No solution files found in '/home/cisadmin/sample-dotnet-projec1/test'
info: OmniSharp.MSBuild.ProjectManager
Queue project update for '/home/cisadmin/sample-dotnet-projec1/test/test.csproj'
info: OmniSharp.Script.ScriptProjectSystem
Detecting CSX files in '/home/cisadmin/sample-dotnet-projec1/test'.
info: OmniSharp.Script.ScriptProjectSystem
Could not find any CSX files
info: OmniSharp.WorkspaceInitializer
Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.CSharpFormattingWorkspaceOptionsProvider, Order: 0
info: OmniSharp.WorkspaceInitializer
Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.Completion.CompletionOptionsProvider, Order: 0
info: OmniSharp.WorkspaceInitializer
Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.RenameWorkspaceOptionsProvider, Order: 100
info: OmniSharp.WorkspaceInitializer
Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.ImplementTypeWorkspaceOptionsProvider, Order: 110
info: OmniSharp.WorkspaceInitializer
Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.BlockStructureWorkspaceOptionsProvider, Order: 140
info: OmniSharp.WorkspaceInitializer
Configuration finished.
info: OmniSharp.MSBuild.ProjectManager
Loading project: /home/cisadmin/sample-dotnet-projec1/test/test.csproj
info: OmniSharp.Stdio.Host
Omnisharp server running using Stdio at location '/home/cisadmin/sample-dotnet-projec1/test' on host 64206.
fail: OmniSharp.MSBuild.ProjectLoader
The "Microsoft.AspNetCore.Razor.Tasks.DiscoverDefaultScopedCssItems" task could not be loaded from the assembly /usr/lib64/dotnet/sdk/5.0.102/Sdks/Microsoft.NET.Sdk.Razor/build/netstandard2.0/../../tasks/net46/Microsoft.NET.Sdk.Razor.Tasks.dll. Invalid Image Confirm that the declaration is correct, that the assembly and all its dependencies are available, and that the task contains a public class that implements Microsoft.Build.Framework.ITask.
[warn]: OmniSharp.MSBuild.ProjectManager
Failed to load project file '/home/cisadmin/sample-dotnet-projec1/test/test.csproj'.
/home/cisadmin/sample-dotnet-projec1/test/test.csproj
/usr/lib64/dotnet/sdk/5.0.102/Sdks/Microsoft.NET.Sdk.Razor/build/netstandard2.0/Microsoft.NET.Sdk.Razor.ScopedCss.targets(118,3): Error: The "Microsoft.AspNetCore.Razor.Tasks.DiscoverDefaultScopedCssItems" task could not be loaded from the assembly /usr/lib64/dotnet/sdk/5.0.102/Sdks/Microsoft.NET.Sdk.Razor/build/netstandard2.0/../../tasks/net46/Microsoft.NET.Sdk.Razor.Tasks.dll. Invalid Image Confirm that the declaration is correct, that the assembly and all its dependencies are available, and that the task contains a public class that implements Microsoft.Build.Framework.ITask.

Attempted to update project that is not loaded: /home/cisadmin/sample-dotnet-projec1/test/test.csproj

Steps to reproduce

dotnet new webapi -n test
code .

Expected behavior

C# extension would load

Actual behavior

C# extension fails to load

VS Code version:
1.52.1

C# Extension version:
1.23.8

Please paste the output from your clipboard$ dotnet --info
.NET SDK (reflecting any global.json):
Version: 5.0.102
Commit: 71365b4d42

Runtime Environment:
OS Name: centos
OS Version: 8
OS Platform: Linux
RID: centos.8-x64
Base Path: /usr/lib64/dotnet/sdk/5.0.102/

Host (useful for support):
Version: 5.0.2
Commit: cb5f173b96

.NET SDKs installed:
5.0.102 [/usr/lib64/dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 5.0.2 [/usr/lib64/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 5.0.2 [/usr/lib64/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET runtimes or SDKs:
https://aka.ms/dotnet-download

[michaelbarkdoll]

Is there any file that I can try to modify to get around this issue? Thanks,

[michaelbarkdoll]

Hello?

[michaelbarkdoll]

I tried install from:

sudo rpm -Uvh https://packages.microsoft.com/config/centos/8/packages-microsoft-prod.rpm
yum install dotnet-sdk-5.0

Issue was still present.

[michaelbarkdoll]

Tried v1.23.9-beta2 this morning. Error exists there as well. Where do I find instructions on compiling the source code into .vsix to diagnosis this further?

[filipw]

@NTaylorMullen @ryanbrandenburg do you have any ideas what might be causing this? Also, this doesn't seem like an OmniSharp issue to me

[michaelbarkdoll]

I'm thinking the issue is with the actual dotnet-sdk installation since once it was upgraded the issue started to occur. I tried to isolate the issue a bit further by installing a new development environment on Ubuntu 20.04 LTS and setup a "Remote - SSH" to it from RHEL 8. I was able to install the C# extension on the remote visual code ssh connection without the same error. Who maintains the dotnet-sdk-5.0 rpm package RHEL or Microsoft? Should I open a issue about this inside the larger dotnet/sdk projec or is it a VS Code issue?

[michaelbarkdoll]

Ok, I see now that on the Ubuntu 20.04 LTS dotnet-sdk-5.0 package installation it installed:
/usr/share/dotnet/sdk/5.0.102/Sdks/Microsoft.NET.Sdk.Razor/tasks/net46/Microsoft.NET.Sdk.Razor.Tasks.dll
/usr/share/dotnet/sdk/5.0.102/Sdks/Microsoft.NET.Sdk.Razor/tasks/net5.0/Microsoft.NET.Sdk.Razor.Tasks.dll

However, my CentOS 8 only has the following file installed:
/usr/lib64/dotnet/sdk/5.0.102/Sdks/Microsoft.NET.Sdk.Razor/tasks/net5.0/Microsoft.NET.Sdk.Razor.Tasks.dll

So it appears that in RHEL/CentOS 8 the following file(s) are missing:
/usr/lib64/dotnet/sdk/5.0.102/Sdks/Microsoft.NET.Sdk.Razor/tasks/net46/Microsoft.NET.Sdk.Razor.Tasks.dll

ls -la tasks/net46/
-rw-r--r-- 1 root root 77192 Dec 14 20:17 Microsoft.NET.Sdk.Razor.Tasks.dll
-rw-r--r-- 1 root root 189832 Dec 14 20:17 System.Collections.Immutable.dll
-rw-r--r-- 1 root root 464776 Dec 14 20:17 System.Reflection.Metadata.dll

[NTaylorMullen]

@SteveSandersonMS Given this is in relation to the CSS isolation bits, do you have insight here?

[michaelbarkdoll]

The following resolved the error for me on CentOS 8:
sudo yum remove dotnet-sdk

sudo yum install dotnet-sdk-5.0-5.0.101-1 aspnetcore-runtime-5.0-5.0.1-1 aspnetcore-targeting-pack-5.0-5.0.0-1 dotnet-apphost-pack-5.0-5.0.1-1 dotnet-host-5.0.1-1 dotnet-hostfxr-5.0-5.0.1-1 dotnet-runtime-5.0-5.0.1-1 dotnet-targeting-pack-5.0-5.0.0-1

Appears some things moved around on the reinstall in terms of file location for the Microsoft.NET.Sdk.Razor.Tasks.dll:

/usr/share/dotnet/sdk/5.0.101/Sdks/Microsoft.NET.Sdk.Razor/tasks/net46/Microsoft.NET.Sdk.Razor.Tasks.dll
/usr/share/dotnet/sdk/5.0.101/Sdks/Microsoft.NET.Sdk.Razor/tasks/net5.0/Microsoft.NET.Sdk.Razor.Tasks.dll

How can this be resolved?

[SteveSandersonMS]

@NTaylorMullen Looks like an issue in the SDK packaging, if it can be fixed by moving assembly files around. It seems like the CSS isolation task just happens to be the first thing it's trying to load.

[Kampfmoehre]

I had a problem with dotnet/sdk#15863 and completely removed all dotnet packages, disabled the MS prod repo and installad dotnet-sdk-3.1 and dotnet-sdk-5.0 again. With dotnet 5.0.102 I now have the same problem loading a Blazor Server project. Is there anything I can install/change to make this work again until this is fixed?

Edit: I am running Fedora 33

Edit 2: I resolved the problem by again removing all packages and install the SDKs again - this time using the microsoft prod repo:

• sudo dnf remove dotnet*
• sudo dnf install dotnet-sdk-5.0.x86_64 dotnet-sdk-3.1.x86_64 --repo packages-microsoft-com-prod

I am using Fedora 33 and the sdk is provided by Fedora Update Repo too. It seems one SDK was installed via updates and one via ms prod repo and this is causing many problems. After removing all dotnet packages and install the SDKs again now Omnisharp seems to work without any error messages.

dotnet --info output:

dotnet --info
.NET SDK (reflecting any global.json):
 Version:   5.0.103
 Commit:    9effbc8ad5

Runtime Environment:
 OS Name:     fedora
 OS Version:  33
 OS Platform: Linux
 RID:         fedora.33-x64
 Base Path:   /usr/share/dotnet/sdk/5.0.103/

Host (useful for support):
  Version: 5.0.3
  Commit:  eae88cc11b

.NET SDKs installed:
  3.1.406 [/usr/share/dotnet/sdk]
  5.0.103 [/usr/share/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 3.1.12 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.3 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 3.1.12 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.3 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET runtimes or SDKs:
  https://aka.ms/dotnet-download