Did not find 'Microsoft.NETCore.App' in lock file.

Issue Description

After installing the latest version of Omnisharp (1.34.4) I’m still experiencing issues running VSCode similar to those described in https://github.com/OmniSharp/omnisharp-vscode/issues/3290.

I don’t have much experience diagnosing Omnisharp issues but my guess is that it’s something to do with the missing reference to Microsoft.NETCore.App. I can see from the log that I have 2 MSBuild instances installed and it appears to be using the Mono 6.4 one rather than the Standalone.

Steps to Reproduce

• dotnet new console
• dotnet build/run - works as expected
• Open VSCode

Expected Behavior

C# extension features to work as expected.

Actual Behavior

Lots of “errors”, due to missing references:

Logs

OmniSharp log

Starting OmniSharp server at 03/10/2019, 21:56:18
    Target: /Users/ben.foster/source/checkout-bootstrap-dotnet/SqsConsumer

OmniSharp server started with Mono 6.4.0.
    Path: /Users/ben.foster/.vscode/extensions/ms-vscode.csharp-1.21.4/.omnisharp/1.34.4/omnisharp/OmniSharp.exe
    PID: 51738

[info]: OmniSharp.Stdio.Host
        Starting OmniSharp on MacOS 10.13.4 (x64)
[info]: OmniSharp.Services.DotNetCliService
        DotNetPath set to dotnet
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Located 2 MSBuild instance(s)
            1: Mono 16.0 - "/usr/local/Cellar/mono/6.4.0.198/lib/mono/msbuild/Current/bin"
            2: StandAlone 16.0 - "/Users/ben.foster/.vscode/extensions/ms-vscode.csharp-1.21.4/.omnisharp/1.34.4/omnisharp/.msbuild/Current/Bin"
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Registered MSBuild instance: Mono 16.0 - "/usr/local/Cellar/mono/6.4.0.198/lib/mono/msbuild/Current/bin"
            CscToolExe = csc.exe
            CscToolPath = /Users/ben.foster/.vscode/extensions/ms-vscode.csharp-1.21.4/.omnisharp/1.34.4/omnisharp/.msbuild/Current/Bin/Roslyn
[info]: OmniSharp.Cake.CakeProjectSystem
        Detecting Cake files in '/Users/ben.foster/source/checkout-bootstrap-dotnet/SqsConsumer'.
[info]: OmniSharp.Cake.CakeProjectSystem
        Could not find any Cake files
[info]: OmniSharp.MSBuild.ProjectSystem
        No solution files found in '/Users/ben.foster/source/checkout-bootstrap-dotnet/SqsConsumer'
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for '/Users/ben.foster/source/checkout-bootstrap-dotnet/SqsConsumer/SqsConsumer.csproj'
[info]: OmniSharp.Script.ScriptProjectSystem
        Detecting CSX files in '/Users/ben.foster/source/checkout-bootstrap-dotnet/SqsConsumer'.
[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/ben.foster/source/checkout-bootstrap-dotnet/SqsConsumer/SqsConsumer.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/ben.foster/source/checkout-bootstrap-dotnet/SqsConsumer' on host 51191.
[info]: OmniSharp.MSBuild.ProjectManager
        Successfully loaded project file '/Users/ben.foster/source/checkout-bootstrap-dotnet/SqsConsumer/SqsConsumer.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
        Adding project '/Users/ben.foster/source/checkout-bootstrap-dotnet/SqsConsumer/SqsConsumer.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Update project: SqsConsumer
[warn]: OmniSharp.MSBuild.PackageDependencyChecker
        SqsConsumer: Did not find 'Microsoft.NETCore.App' in lock file.

C# log

Post the output from Output-->C# here

Environment information

VSCode version: 1.38.1 C# Extension: 1.21.4

Mono Information

OmniSharp using global mono :6.4.0

Dotnet Information

.NET Core SDK (reflecting any global.json): Version: 3.0.100 Commit: 04339c3a26

Runtime Environment: OS Name: Mac OS X OS Version: 10.13 OS Platform: Darwin RID: osx.10.13-x64 Base Path: /usr/local/share/dotnet/sdk/3.0.100/

Host (useful for support): Version: 3.0.0 Commit: 7d57652f33

.NET Core SDKs installed: 2.1.302 [/usr/local/share/dotnet/sdk] 2.1.500 [/usr/local/share/dotnet/sdk] 2.2.104 [/usr/local/share/dotnet/sdk] 3.0.100 [/usr/local/share/dotnet/sdk]

.NET Core runtimes installed: Microsoft.AspNetCore.All 2.1.2 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.All] Microsoft.AspNetCore.All 2.1.6 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.All] Microsoft.AspNetCore.All 2.2.2 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.All] Microsoft.AspNetCore.App 2.1.2 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 2.1.6 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 2.2.2 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 3.0.0 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App] Microsoft.NETCore.App 2.1.2 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 2.1.6 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 2.2.2 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 3.0.0 [/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
bower	donjayamanne	0.0.3
cake-vscode	cake-build	0.12.0
csharp	ms-vscode	1.21.4
csharpextensions	jchannon	1.3.0
css-compressor	bestvow	0.0.2
docomment	k–kato	0.1.8
dotnet-test-explorer	formulahendry	0.7.1
EditorConfig	EditorConfig	0.13.0
gitlens	eamodio	10.0.1
Lua	keyring	0.0.9
markdown-pdf	yzane	1.3.1
mssql	ms-mssql	1.6.0
openapi-lint	mermade	1.0.4
plantuml	jebbs	2.12.1
vscode-css-formatter	aeschli	1.0.1
vscode-docker	ms-azuretools	0.8.1
vscode-mocha-test-adapter	hbenl	2.1.2
vscode-mysql	formulahendry	0.4.0
vscode-nuget-package-manager	jmrog	1.1.6
vscode-proto3	zxh404	0.3.0
vscode-pull-request-github	GitHub	0.11.2
vscode-test-explorer	hbenl	2.14.6
vscode-yaml	redhat	0.5.3
vsliveshare	ms-vsliveshare	1.0.905

[filipw]

Mono here https://www.mono-project.com/download/stable/ comes with everything correctly configured, you may want to prefer it over the homebrew distro.

[filipw]

looks like you have a global mono without msbuild with an older msbuild (not 16.3) Either install global Mono with msbuild 16.3 or try setting "omnisharp.useGlobalMono": "never"