Omnisharp not working on Mac

[lt-gerjan]

After installing all new versions (.NET Core, Mono, VS Code, Blazor template), omnisharp does not work anymore.

Logs

OmniSharp log

Starting OmniSharp server at 11/14/2019, 10:59:46 PM Target: /Users/gerjan/Development/BlazorPortfolio

OmniSharp server started with Mono 6.4.0.
Path: /Users/gerjan/.vscode/extensions/ms-vscode.csharp-1.21.7/.omnisharp/1.34.7/omnisharp/OmniSharp.exe
PID: 81837

Starting OmniSharp on MacOS 10.15.1 (x64)
info: OmniSharp.Services.DotNetCliService
DotNetPath set to dotnet
info: OmniSharp.MSBuild.Discovery.MSBuildLocator
Located 2 MSBuild instance(s)
1: Mono 16.3 - "/usr/local/Cellar/mono/6.4.0.198/lib/mono/msbuild/Current/bin"
2: StandAlone 16.3 - "/Users/gerjan/.vscode/extensions/ms-vscode.csharp-1.21.7/.omnisharp/1.34.7/omnisharp/.msbuild/Current/Bin"
info: OmniSharp.MSBuild.Discovery.MSBuildLocator
Registered MSBuild instance: Mono 16.3 - "/usr/local/Cellar/mono/6.4.0.198/lib/mono/msbuild/Current/bin"
CscToolExe = csc.exe
CscToolPath = /Users/gerjan/.vscode/extensions/ms-vscode.csharp-1.21.7/.omnisharp/1.34.7/omnisharp/.msbuild/Current/Bin/Roslyn
info: OmniSharp.Cake.CakeProjectSystem
Detecting Cake files in '/Users/gerjan/Development/BlazorPortfolio'.
info: OmniSharp.Cake.CakeProjectSystem
Could not find any Cake files
info: OmniSharp.MSBuild.ProjectSystem
No solution files found in '/Users/gerjan/Development/BlazorPortfolio'
info: OmniSharp.MSBuild.ProjectManager
Queue project update for '/Users/gerjan/Development/BlazorPortfolio/BlazorPortfolio.csproj'
info: OmniSharp.Script.ScriptProjectSystem
Detecting CSX files in '/Users/gerjan/Development/BlazorPortfolio'.
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.MSBuild.ProjectManager
Loading project: /Users/gerjan/Development/BlazorPortfolio/BlazorPortfolio.csproj
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.EditorConfigWorkspaceOptionsProvider, Order: 200
info: OmniSharp.WorkspaceInitializer
Configuration finished.
info: OmniSharp.Stdio.Host
Omnisharp server running using Stdio at location '/Users/gerjan/Development/BlazorPortfolio' on host 81814.
info: OmniSharp.MSBuild.ProjectManager
Successfully loaded project file '/Users/gerjan/Development/BlazorPortfolio/BlazorPortfolio.csproj'.
info: OmniSharp.MSBuild.ProjectManager
Adding project '/Users/gerjan/Development/BlazorPortfolio/BlazorPortfolio.csproj'
info: OmniSharp.MSBuild.ProjectManager
Update project: BlazorPortfolio
[warn]: OmniSharp.MSBuild.PackageDependencyChecker
BlazorPortfolio: Did not find 'Microsoft.NETCore.App' in lock file.

C# log

This one is empty

Environment information

VSCode version: 1.40.1
C# Extension: 1.21.7

Mono Information

OmniSharp using global mono :6.4.0

Dotnet Information

.NET Core SDK (reflecting any global.json): Version: 3.1.100-preview3-014645 Commit: b32d27f4b3

Runtime Environment:
OS Name: Mac OS X
OS Version: 10.15
OS Platform: Darwin
RID: osx.10.15-x64
Base Path: /usr/local/share/dotnet/sdk/3.1.100-preview3-014645/

Host (useful for support):
Version: 3.1.0-preview3.19553.2
Commit: 13f35c3d86

.NET Core SDKs installed:
3.1.100-preview3-014645 [/usr/local/share/dotnet/sdk]

.NET Core runtimes installed:
Microsoft.AspNetCore.App 3.1.0-preview3.19555.2 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 3.1.0-preview3.19553.2 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

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

Visual Studio Code Extensions

Extension	Author	Version
bracket-pair-colorizer-2	CoenraadS	0.0.28
csharp	ms-vscode	1.21.7
haskelly	UCL	0.5.5
Ionide-FAKE	Ionide	1.2.3
Ionide-fsharp	Ionide	4.3.1
Ionide-Paket	Ionide	1.12.0
language-haskell	justusadam	2.6.0
material-icon-theme	PKief	3.9.1
Material-theme	zhuangtongfa	2.28.3
nord-visual-studio-code	arcticicestudio	0.12.0
python	ms-python	2019.10.44104
rest-client	humao	0.22.2
rust	rust-lang	0.7.0
theme-dracula	dracula-theme	2.18.1
Theme-MaterialKit	ms-vscode	0.1.4
vscode-icons	vscode-icons-team	9.5.0
vscode-theme-onedark	akamud	2.1.0
vsliveshare	ms-vsliveshare	1.0.1245

[lt-gerjan]

[lt-gerjan]

One error that stands out:

[warn]: OmniSharp.MSBuild.PackageDependencyChecker
BlazorPortfolio: Did not find 'Microsoft.NETCore.App' in lock file.

[lt-gerjan]

Looks similar to #3314

[lt-gerjan]

I have installed mono with brew

brew install mono
mono --version

gives

Mono JIT compiler version 6.4.0.198 (tarball Mon Sep 30 16:34:14 BST 2019)

and msbuild

Microsoft (R) Build Engine version 16.1.85+gad9c9926a7 for Mono

[lt-gerjan]

After uninstalling mono with brew (brew uninstall mono), and installing it via https://www.mono-project.com/download/stable/, everything works ✅

mono --version

Mono JIT compiler version 6.4.0.198 (2019-06/fe64a4765e6 Wed Sep 18 14:14:51 EDT 2019)

msbuild

Microsoft (R) Build Engine version 16.3.0-ci for Mono

[lt-gerjan]

So the problem is (I think), mono via brew ships an older version of msbuild (16.1 vs 16.3)

[JoeRobich]

Hi @gerjandev,

Glad things are working for you now. We definitely prefer the mono installer over a brew install.

-Joey