System.Threading.Tasks.Dataflow, Version=4.5.24.0 not found by OmniSharp

Environment data

dotnet --info output:

.NET Core SDK (reflecting any global.json):
 Version:   2.2.103
 Commit:    8edbc2570a

Runtime Environment:
 OS Name:     fedora
 OS Version:  29
 OS Platform: Linux
 RID:         fedora.29-x64
 Base Path:   /usr/lib64/dotnet/sdk/2.2.103/

Host (useful for support):
  Version: 2.2.1
  Commit:  878dd11e62

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

.NET Core runtimes installed:
  Microsoft.NETCore.App 2.2.1 [/usr/lib64/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs:
  https://aka.ms/dotnet-download
(rishvic) [rishvic@localhost Teleportation]$ code --version
1.31.1
1b8e8302e405050205e69b59abb3559592bb9e60
x64

VS Code version: 1.31.1 C# Extension version: 1.17.1

Steps to reproduce

1. Install VS-Code
2. Install C# Extension
3. Run Omnisharp server (Starts automatically when VS-Code is opened)

Expected behavior

Omnisharp server to run properly

Actual behavior

(Installs .NET Core debugger, Razor server, and OmniSharp when newly installed)
Finished

Getting latest OmniSharp version information

Then cuts to

Starting OmniSharp server at 20/2/2019, 1:09:11 AM
    Target: /home/rishvic/Documents/Dev/Quany/Bell

OmniSharp server started with Mono 6.1.0.
    Path: /home/rishvic/.vscode/extensions/ms-vscode.csharp-1.17.1/.omnisharp/1.32.11-beta.10/omnisharp/OmniSharp.exe
    PID: 7532

[info]: OmniSharp.Stdio.Host
        Starting OmniSharp on fedora 29.0 (x64)
[info]: OmniSharp.Services.DotNetCliService
        DotNetPath set to dotnet
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Located 1 MSBuild instance(s)
            1: StandAlone 15.0 - "/home/rishvic/.vscode/extensions/ms-vscode.csharp-1.17.1/.omnisharp/1.32.11-beta.10/omnisharp/msbuild/15.0/Bin"
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        MSBUILD_EXE_PATH environment variable set to '/home/rishvic/.vscode/extensions/ms-vscode.csharp-1.17.1/.omnisharp/1.32.11-beta.10/omnisharp/msbuild/15.0/Bin/MSBuild.dll'
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Registered MSBuild instance: StandAlone 15.0 - "/home/rishvic/.vscode/extensions/ms-vscode.csharp-1.17.1/.omnisharp/1.32.11-beta.10/omnisharp/msbuild/15.0/Bin"
            CscToolExe = csc.exe
            TargetFrameworkRootPath = /usr/lib/mono/xbuild-frameworks
            MSBuildToolsPath = /home/rishvic/.vscode/extensions/ms-vscode.csharp-1.17.1/.omnisharp/1.32.11-beta.10/omnisharp/msbuild/15.0/Bin
            CscToolPath = /home/rishvic/.vscode/extensions/ms-vscode.csharp-1.17.1/.omnisharp/1.32.11-beta.10/omnisharp/msbuild/15.0/Bin/Roslyn
            BypassFrameworkInstallChecks = true
            MSBuildExtensionsPath = /home/rishvic/.vscode/extensions/ms-vscode.csharp-1.17.1/.omnisharp/1.32.11-beta.10/omnisharp/msbuild
System.TypeLoadException: Could not load type of field 'OmniSharp.MSBuild.ProjectManager:_queue' (13) due to: Could not load file or assembly 'System.Threading.Tasks.Dataflow, Version=4.5.24.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies.
  at (wrapper managed-to-native) System.RuntimeType.GetPropertiesByName_native(System.RuntimeType,intptr,System.Reflection.BindingFlags,System.RuntimeType/MemberListType)
  at System.RuntimeType.GetPropertiesByName (System.String name, System.Reflection.BindingFlags bindingAttr, System.RuntimeType+MemberListType listType, System.RuntimeType reflectedType) [0x0001b] in <55f2d61d61144ad598ea3e2fc5ec8cc5>:0 
  at System.RuntimeType.GetPropertyCandidates (System.String name, System.Reflection.BindingFlags bindingAttr, System.Type[] types, System.Boolean allowPrefixLookup) [0x00010] in <55f2d61d61144ad598ea3e2fc5ec8cc5>:0 
  at System.RuntimeType.GetProperties (System.Reflection.BindingFlags bindingAttr) [0x00000] in <55f2d61d61144ad598ea3e2fc5ec8cc5>:0 
  at System.Reflection.RuntimeReflectionExtensions.GetRuntimeProperties (System.Type type) [0x00014] in <55f2d61d61144ad598ea3e2fc5ec8cc5>:0 
  at System.Composition.TypedParts.Discovery.TypeInspector+<DiscoverPropertyExports>d__7.MoveNext () [0x00030] in <9aac21a4a3f24063b2b8b59143acddfc>:0 
  at System.Composition.TypedParts.Discovery.TypeInspector+<DiscoverExports>d__5.MoveNext () [0x000dc] in <9aac21a4a3f24063b2b8b59143acddfc>:0 
  at System.Composition.TypedParts.Discovery.TypeInspector.InspectTypeForPart (System.Reflection.TypeInfo type, System.Composition.TypedParts.Discovery.DiscoveredPart& part) [0x00061] in <9aac21a4a3f24063b2b8b59143acddfc>:0 
  at System.Composition.TypedParts.TypedPartExportDescriptorProvider..ctor (System.Collections.Generic.IEnumerable`1[T] types, System.Composition.Convention.AttributedModelProvider attributeContext) [0x00037] in <9aac21a4a3f24063b2b8b59143acddfc>:0 
  at System.Composition.Hosting.ContainerConfiguration.CreateContainer () [0x00042] in <9aac21a4a3f24063b2b8b59143acddfc>:0 
  at OmniSharp.CompositionHostBuilder.Build () [0x001f6] in <089b5f80b8a94280985736532a696e5f>:0 
  at OmniSharp.Stdio.Host..ctor (System.IO.TextReader input, OmniSharp.Stdio.Services.ISharedTextWriter writer, OmniSharp.IOmniSharpEnvironment environment, System.IServiceProvider serviceProvider, OmniSharp.CompositionHostBuilder compositionHostBuilder, Microsoft.Extensions.Logging.ILoggerFactory loggerFactory, System.Threading.CancellationTokenSource cancellationTokenSource) [0x00057] in <8063bf3b8d6e4dfaad87782f50455b9b>:0 
  at OmniSharp.Stdio.Driver.Program+<>c__DisplayClass0_1.<Main>b__1 () [0x00138] in <1d0439f055d94458aeda3584fc00bd89>:0 
  at OmniSharp.CommandLineApplication+<>c__DisplayClass11_0.<OnExecute>b__0 () [0x0000b] in <089b5f80b8a94280985736532a696e5f>:0 
  at McMaster.Extensions.CommandLineUtils.CommandLineApplication.Execute (System.String[] args) [0x00039] in <344a1e8cd6594b17b1e01f8df6ae8827>:0 
  at OmniSharp.CommandLineApplication.Execute (System.Collections.Generic.IEnumerable`1[T] args) [0x00042] in <089b5f80b8a94280985736532a696e5f>:0 
  at OmniSharp.Stdio.Driver.Program+<>c__DisplayClass0_0.<Main>b__0 () [0x00028] in <1d0439f055d94458aeda3584fc00bd89>:0 
  at OmniSharp.HostHelpers.Start (System.Func`1[TResult] action) [0x0001c] in <089b5f80b8a94280985736532a696e5f>:0 

(Output mode is on debug)

[rishvic]

It worked by changing the setting omnisharp.useGlobalMono: never. I think the issue can be closed. Thanks for helping with this issue this long.

[akshita31]

Here is a similar issue and it was resolved by setting the MsbuildSdkPath. Can you try that and check if the error reproduces ?