Command Select Project fails with extension manifest validation error

[mauve]

Issue Description

Steps to Reproduce

• Ctrl-Shift-P: "OmniSharp: Select project"
• Error is shown
  

Expected Behavior

Opens up the project picker.

Actual Behavior

Command 'OmniSharp: Select Project' resulted in an error (Extension 'ms-dotnettools.csharp' CANNOT use API proposal: quickPickSeparators. Its package.json#enabledApiProposals-property declares: [] but NOT quickPickSeparators. The missing proposal must be added...

Logs

OmniSharp log

Post the output from Output-->OmniSharp log here

C# log

Post the output from Output-->C# here

Environment information

VSCode version: 1.63.0
C# Extension: 1.23.17

Mono Information

OmniSharp using built-in mono

Dotnet Information

.NET SDK (reflecting any global.json): Version: 6.0.100 Commit: 9e8b04bbff

Runtime Environment:
OS Name: ubuntu
OS Version: 20.04
OS Platform: Linux
RID: ubuntu.20.04-x64
Base Path: /usr/share/dotnet/sdk/6.0.100/

Host (useful for support):
Version: 6.0.0
Commit: 4822e3c3aa

.NET SDKs installed:
2.1.818 [/usr/share/dotnet/sdk]
3.1.415 [/usr/share/dotnet/sdk]
5.0.403 [/usr/share/dotnet/sdk]
6.0.100-rc.1.21458.32 [/usr/share/dotnet/sdk]
6.0.100 [/usr/share/dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.All 2.1.30 [/usr/share/dotnet/shared/Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.30 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.21 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.12 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.0-rc.1.21452.15 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.0 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 2.1.30 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.21 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.12 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.0-rc.1.21451.13 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.0 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

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

Visual Studio Code Extensions

Extension	Author	Version
azure-account	ms-vscode	0.9.11
azure-pipelines	ms-azure-devops	1.195.0
cmake	twxs	0.0.17
cmake-tools	ms-vscode	1.9.2
cpptools	ms-vscode	1.8.0-insiders2
csharp	ms-dotnettools	1.23.17
dotnet-test-explorer	formulahendry	0.7.7
EditorConfig	EditorConfig	0.16.4
jupyter	ms-toolsai	2021.11.1001550889
jupyter-renderers	ms-toolsai	1.0.4
live-server	ms-vscode	0.2.11
LiveServer	ritwickdey	5.6.1
prettier-vscode	esbenp	9.0.0
python	ms-python	2021.12.1559732655
sass-indented	syler	1.8.18
test-adapter-converter	ms-vscode	0.1.4
vetur	octref	0.35.0
vscode-azureappservice	ms-azuretools	0.23.0
vscode-azurefunctions	ms-azuretools	1.6.0
vscode-azureresourcegroups	ms-azuretools	0.4.0
vscode-azurestaticwebapps	ms-azuretools	0.9.0
vscode-bicep	ms-azuretools	0.4.1008
vscode-docker	ms-azuretools	1.18.0
vscode-dotnet-runtime	ms-dotnettools	1.5.0
vscode-eslint	dbaeumer	2.2.2
vscode-kubernetes-tools	ms-kubernetes-tools	1.3.4
vscode-pylance	ms-python	2021.12.1
vscode-test-explorer	hbenl	2.21.1
vscode-yaml	redhat	1.2.2
vsliveshare	ms-vsliveshare	1.0.5196
xml	DotJoshJohnson	2.5.1

[TanayParikh]

Getting the same error:

Command 'OmniSharp: Select Project' resulted in an error (Extension 'ms-dotnettools.csharp' CANNOT use API proposal: quickPickSeparators.
Its package.json#enabledApiProposals-property declares: [] but NOT quickPickSeparators.
The missing proposal MUST be added and you must start in extension development mode or use the following command line switch: --enable-proposed-api ms-dotnettools.csharp)

[JoeRobich]

Issue was fixed in #4914. Until a new release is ready you can install this prerelease that includes the fix https://github.com/OmniSharp/omnisharp-vscode/releases/tag/v1.23.18-beta2

[jesperkristensen]

Does anyone know how to install an old working version until a fix is released? My VS Code is basically bricked now. (Installing a prerelease sounds a bit scary)

[PsychoNineSix]

Does anyone know how to install an old working version until a fix is released? My VS Code is basically bricked now. (Installing a prerelease sounds a bit scary)

Old version of omnisharp won't work, I believe it was broken by vscode 1.63, so you either move back to 1.62 or install the pre-release of omnisharp.

[OdisBy]

Does anyone know how to install an old working version until a fix is released? My VS Code is basically bricked now. (Installing a prerelease sounds a bit scary)

Omnisharp can't be downgrade, but downgrading vscode you resolve this problem. https://code.visualstudio.com/updates/v1_62

[CEbbinghaus]

Even after installing the latest prerelease this issue still occurs.

Is there prerelease versions which don't include the fix and I need to download exactly 1.23.18?

[tabish121]

I found that the solution was to completely uninstall the old version and then choose the extension vsix file for my platform from the beta release page and install that:
https://github.com/OmniSharp/omnisharp-vscode/releases/tag/v1.23.18-beta2

[JoeRobich]

There have been lots of improvements since this issue was opened. Please open a new issue with logs if you are still running into this.