OmniSharp cannot locate Mono when using Z shell on macOS

[alexdima]

Moved from microsoft/vscode#17049

From @rslnautic

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• VSCode Version: 1.7.2
• OS Version: MacOs 10.12.1
  I use zsh. Not bash.

I can't use intellisense with C# and unity 5.5. I've tried hard but I can't solve it. Please Help!

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Starting OmniSharp server at 12/11/2016, 6:41:17 PM
Target: /Users/rsl/Desktop/Jugs/Jugs.sln

OmniSharp server started wth Mono
Path: /Users/rsl/.vscode/extensions/ms-vscode.csharp-1.5.3/bin/run
PID: 881

OmniSharp: -s /Users/rsl/Desktop/Jugs/Jugs.sln --hostPID 865 --stdio DotNet:enablePackageRestore=false --encoding utf-8
{"Event":"log","Body":{"LogLevel":"INFORMATION","Name":"OmniSharp.Startup","Message":"Omnisharp server running using Stdio at location '/Users/rsl/Desktop/Jugs' on host 865."},"Seq":1,"Type":"event"}
[INFORMATION:OmniSharp.DotNet.DotNetProjectSystem] Initializing in /Users/rsl/Desktop/Jugs
[INFORMATION:OmniSharp.DotNet.DotNetProjectSystem] Auto package restore: False
[INFORMATION:OmniSharp.DotNet.DotNetProjectSystem] Update workspace context
[INFORMATION:OmniSharp.DotNet.DotNetProjectSystem] Resolving projects references
[INFORMATION:OmniSharp#MSBuild] Detecting projects in '/Users/rsl/Desktop/Jugs/Jugs.sln'.
[INFORMATION:OmniSharp#MSBuild] Loading project from '/Users/rsl/Desktop/Jugs/Assembly-CSharp.csproj'.
[WARNING:OmniSharp#ProjectFileInfo] Couldn't locate Mono, TargetFrameworkRootPath not specified
[INFORMATION:OmniSharp#ProjectFileInfo] Using tools version: 15.0
[ERROR:OmniSharp#ProjectFileInfo] The reference assemblies for framework ".NETFramework,Version=v3.5" were not found. To resolve this, install the SDK or Targeting Pack for this framework version or retarget your application to a version of the framework for which you have the SDK or Targeting Pack installed. Note that assemblies will be resolved from the Global Assembly Cache (GAC) and will be used in place of reference assemblies. Therefore your assembly may not be correctly targeted for the framework you intend.
[WARNING:OmniSharp#MSBuild] Failed to process project file '/Users/rsl/Desktop/Jugs/Assembly-CSharp.csproj'.
/Users/rsl/Desktop/Jugs/Assembly-CSharp.csproj

[INFORMATION:OmniSharp.Startup] Configuration finished.

[michaelybecker]

Same here!

Macbook Pro, OSX v. 10.11.6
Unity 5.5.0f3 (the latest stable)
VSCode 1.7.2

Relevant Omnisharp log:
OmniSharp: -s /Volumes/HD-MAIN/Unity Projects/LD37/LD37.sln --hostPID 4814 --stdio DotNet:enablePackageRestore=false --encoding utf-8
{"Event":"log","Body":{"LogLevel":"INFORMATION","Name":"OmniSharp.Startup","Message":"Omnisharp server running using Stdio at location '/Volumes/HD-MAIN/Unity Projects/LD37' on host 4814."},"Seq":1,"Type":"event"}
[INFORMATION:OmniSharp.DotNet.DotNetProjectSystem] Initializing in /Volumes/HD-MAIN/Unity Projects/LD37
[INFORMATION:OmniSharp.DotNet.DotNetProjectSystem] Auto package restore: False
[INFORMATION:OmniSharp.DotNet.DotNetProjectSystem] Update workspace context
[INFORMATION:OmniSharp.DotNet.DotNetProjectSystem] Resolving projects references
[INFORMATION:OmniSharp#MSBuild] Detecting projects in '/Volumes/HD-MAIN/Unity Projects/LD37/LD37.sln'.
[INFORMATION:OmniSharp#MSBuild] Loading project from '/Volumes/HD-MAIN/Unity Projects/LD37/Assembly-CSharp-firstpass.csproj'.
[WARNING:OmniSharp#ProjectFileInfo] Couldn't locate Mono, TargetFrameworkRootPath not specified
[INFORMATION:OmniSharp#ProjectFileInfo] Using tools version: 15.0
[ERROR:OmniSharp#ProjectFileInfo] The reference assemblies for framework ".NETFramework,Version=v3.5" were not found. To resolve this, install the SDK or Targeting Pack for this framework version or retarget your application to a version of the framework for which you have the SDK or Targeting Pack installed. Note that assemblies will be resolved from the Global Assembly Cache (GAC) and will be used in place of reference assemblies. Therefore your assembly may not be correctly targeted for the framework you intend.
[WARNING:OmniSharp#MSBuild] Failed to process project file '/Volumes/HD-MAIN/Unity Projects/LD37/Assembly-CSharp-firstpass.csproj'.
/Volumes/HD-MAIN/Unity Projects/LD37/Assembly-CSharp-firstpass.csproj

[INFORMATION:OmniSharp#MSBuild] Loading project from '/Volumes/HD-MAIN/Unity Projects/LD37/Assembly-CSharp.csproj'.
[WARNING:OmniSharp#ProjectFileInfo] Couldn't locate Mono, TargetFrameworkRootPath not specified
[INFORMATION:OmniSharp#ProjectFileInfo] Using tools version: 15.0
[ERROR:OmniSharp#ProjectFileInfo] The reference assemblies for framework ".NETFramework,Version=v3.5" were not found. To resolve this, install the SDK or Targeting Pack for this framework version or retarget your application to a version of the framework for which you have the SDK or Targeting Pack installed. Note that assemblies will be resolved from the Global Assembly Cache (GAC) and will be used in place of reference assemblies. Therefore your assembly may not be correctly targeted for the framework you intend.
[WARNING:OmniSharp#MSBuild] Failed to process project file '/Volumes/HD-MAIN/Unity Projects/LD37/Assembly-CSharp.csproj'.
/Volumes/HD-MAIN/Unity Projects/LD37/Assembly-CSharp.csproj

[INFORMATION:OmniSharp#MSBuild] Loading project from '/Volumes/HD-MAIN/Unity Projects/LD37/Assembly-CSharp-Editor-firstpass.csproj'.
[WARNING:OmniSharp#ProjectFileInfo] Couldn't locate Mono, TargetFrameworkRootPath not specified
[INFORMATION:OmniSharp#ProjectFileInfo] Using tools version: 15.0
[ERROR:OmniSharp#ProjectFileInfo] The reference assemblies for framework ".NETFramework,Version=v3.5" were not found. To resolve this, install the SDK or Targeting Pack for this framework version or retarget your application to a version of the framework for which you have the SDK or Targeting Pack installed. Note that assemblies will be resolved from the Global Assembly Cache (GAC) and will be used in place of reference assemblies. Therefore your assembly may not be correctly targeted for the framework you intend.
[WARNING:OmniSharp#MSBuild] Failed to process project file '/Volumes/HD-MAIN/Unity Projects/LD37/Assembly-CSharp-Editor-firstpass.csproj'.
/Volumes/HD-MAIN/Unity Projects/LD37/Assembly-CSharp-Editor-firstpass.csproj

[INFORMATION:OmniSharp.Startup] Configuration finished.

[potterdai]

It seems you have to install the latest mono from here http://www.mono-project.com/download/
I got the same problem, and got solved afterwards.

[michaelybecker]

Thanks a lot! Fixed it for me. (Mono was downloaded as part of a preview version of Visual Studio for mac, error went away - probably due to that fact.)

[rslnautic]

I've already installed mono. Still doesn't work!
I'm using zsh instead bash

[DustinCampbell]

Likely, it's a problem with detecting the Mono path on zsh. The OmniSharp executes a series of Unix commands ("which", "readlink" and "pwd -P") to locate the real path of "mono". However, that appears to be failing:

[WARNING:OmniSharp#ProjectFileInfo] Couldn't locate Mono, TargetFrameworkRootPath not specified

[bbugh]

This wasn't working for me either, which was confusing because Mono is definitely installed. I checked the VSCode settings to see if there's an omnisharp setting. Sure enough, there's a setting omnisharp.useMono that is false by default. I set it to true in my user settings, restarted VS Code, and that fixed the problem for me.

[DustinCampbell]

This wasn't working for me either, which was confusing because Mono is definitely installed. I checked the VSCode settings to see if there's an omnisharp setting. Sure enough, there's a setting omnisharp.useMono that is false by default. I set it to true in my user settings, restarted VS Code, and that fixed the problem for me.

That may in fact address the problem in some cases. This option has the effect of running OmniSharp on your installed Mono runtime rather than the one it includes.

@bbugh: What OS are you using? Also, are you using Bash or a different shell.

[bbugh]

Ah, right. I'm on Mac OS Sierra, using zsh.

[DustinCampbell]

Thanks for confirming! I've retitled this issue to better describe the underlying bug.

[serialx]

Add mono to PATH and it resolved the problem.

http://stackoverflow.com/questions/32542535/how-to-install-mono-on-macos-so-mono-works-in-terminal

[DustinCampbell]

I think I've got a fix for this one.

[YousufAzadSami]

This wasn't working for me either, which was confusing because Mono is definitely installed. I checked the VSCode settings to see if there's an omnisharp setting. Sure enough, there's a setting omnisharp.useMono that is false by default. I set it to true in my user settings, restarted VS Code, and that fixed the problem for me.

I had to update my mono version to get OmniSharp to use it by default.