Language server error: omnisharp

[ringods]

Hello,

After installing this extension in Zed, I get an error reported in the status bar at the bottom trying to run Omnisharp. When I click on this, I get an untitled editor window with the following info:

Language server error: omnisharp

oneshot canceled
-- stderr--
A fatal error occurred. The required library libhostfxr.dylib could not be found.
If this is a self-contained application, that library should exist in [/Users/ringods/Library/Application Support/Zed/extensions/work/csharp/omnisharp-v1.39.13/].
If this is a framework-dependent application, install the runtime in the global location [/usr/local/share/dotnet/x64] or use the DOTNET_ROOT environment variable to specify the runtime location or register the runtime location in [/etc/dotnet/install_location].

Here some output regarding the pats mentioned above:

$ which dotnet
/usr/local/share/dotnet/dotnet
$ cat /etc/dotnet/install_location
/usr/local/share/dotnet/x64
$ cat /etc/dotnet/install_location_arm64
/usr/local/share/dotnet

and

$ dotnet --list-sdks --list-runtimes
8.0.409 [/usr/local/share/dotnet/sdk]

The dotnet SDK is installed via this Homebrew cask:

https://github.com/isen-ng/homebrew-dotnet-sdk-versions

I am running on an Apple M1 machine, so the arm64 location should be in use.

Am I missing something in my installation?

[UmutComlekci]

I have same Apple Machine and I got same error but I resolved it. You can check this link https://stackoverflow.com/questions/52695238/whats-the-expected-value-for-dotnet-root-variable-when-installing-dotnet-core-f

Simply, I added this line export DOTNET_ROOT="$(dirname $(which dotnet))" to my .zshrc file.

[ringods]

@UmutComlekci thanks for the workaround.

However, I still would like the .NET runtime to be detected correctly on arm64 too.

[martinbryant]

So I came across this issue when I ad the same problem and I am on a Mac M2.

My solution was to delete /etc/dotnet/install_location and then copying /etc/dotnet/install_location_arm64 as /etc/dotnet/install_location. This then told Ominsharp the correct location for the dotnet install for arm_64.

According to my new friend Claude ;)

Why /etc/dotnet/install_location is Being Used

The key insight is from Microsoft's documentation: On an Arm-based Mac, all Arm64 versions of .NET are installed to the normal /usr/local/share/dotnet/ folder. However, when you install the x64 version of .NET SDK, it's installed to the /usr/local/share/dotnet/x64/dotnet/ folder Vim Mode - Zed.

The problem is in the runtime discovery logic:

Dual Architecture Support: Starting with .NET 6, Microsoft introduced side-by-side installation support for both ARM64 and x64 versions on Mac Silicon
Legacy Discovery: The runtime discovery mechanism (used by OmniSharp and other tools) still primarily looks at /etc/dotnet/install_location as the "main" or "default" installation path
Architecture-Specific Files: While /etc/dotnet/install_location_arm64 exists, many tools haven't been updated to prioritize it on ARM64 systems

So this is possibly an issue with Omnisharp rather than this extension

[iancullinane]

I have tried the above and still having failures. I installed dotnet via brew which failed and then installed direct from the site at here.

There is an installation at /usr/local/share/dotnet/dotnet and other applications are fine with this. However unlike the above I do not have a /usr/local/share/dotnet/x64 and no combination of env variables seem to make any difference.

[martinbryant]

@iancullinane what error are you getting?

Also do you have anything at path /etc/dotnet/install_location or /etc/dotnet/install_location_arm64?

[reflectronic]

This is a duplicate of zed-industries/zed#8352