OmniSharp failed to start in Visual Studio Code

Question

I open folder with existing MSBuild project (actually from VS 2012) on C# in VSCode (v. 0.10.3) under Kubuntu 15.04. OmniSharp throw error after start:

[INFO] Starting OmniSharp at '/home/tezaurismosis/Development/NET/ConsoleApp/ConsoleApp.sln'...
[INFO] Started OmniSharp from '/home/tezaurismosis/VSCode/resources/app/extensions/csharp-o/bin/omnisharp' with process id 14956...
System.InvalidOperationException: Failed to resolve the following dependencies for target framework 'DNX,Version=v4.5.1':
    framework/System.Collections 
    framework/System.Collections.Concurrent 
    framework/System.Globalization 
    framework/System.IO 
    framework/System.Net.Http.WebRequest 
    framework/System.Reflection 
    framework/System.Runtime 
    framework/System.Text.Encoding 
    framework/System.Threading.Tasks 
Searched Locations:
... some paths ...
Try running 'dnu restore'.
at Microsoft.Framework.ApplicationHost.Program.Main (System.String[] args) <0xb71f6a58 + 0x0035b> in <filename unknown>:0 
[ERROR] Error: Failed to start OmniSharp

I have installed latest version of Mono (4.2.1) and all subpackages with Mono assemblies, install dnvm and run dnvm upgrade -r mono, run dnu restore, but OmniSharp failed again and again and IntelliSence did'nt work in VSCode.

How can I fix it?

P.S. It's not ASP.NET, just console C# project.

I have a similar issue, but on Linux (debian 8). Were you able to solve this? — Animesh D
– Animesh D, Commented Dec 16, 2015 at 6:23
@Nanda, i can't. Maybe in VSCode non-ASP.NET projects not (yet) supported, i don't know. — tezaurismosis
– tezaurismosis, Commented Dec 20, 2015 at 0:47

Shaun Luttin · Accepted Answer · 2016-03-16 17:57:17Z

4

Your versions might be out of date. Uninstall and reinstall the C# extension in vs code.

Press F1, type ext show installed, press Enter. Click the x to remove it.
Restart vscode.
Press F1, type ext install, press Enter. Click the download icon to install.
Restart vscode.

Ominsharp will now run.

answered Mar 16, 2016 at 17:57

Shaun Luttin

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2 Comments

joshmcode Over a year ago

This bleeding edge stuff is cool, but sometimes painful. Thanks for the simple solution. It worked for me :)

Angel Angel Over a year ago

Your answer was useful, thanks, but in the code version that I have now, after step 1. a list appears in which appears "c # for visual studio code powered by omnisharp" and clicking can be updated. Sorry for my bad english

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