Tried the steps mentioned here, did not resolve the error. Had to do change the omnisharp.useGlobalMono option to always. This worked for C# extension for VS Code=1.23.2. Source: Reddit Post Your error output tells me that you’re using the official C# extension for VS Code. The latest version of said extension, 1.23.2, has this to … Read more
Sometimes C# for Visual Studio Code (powered by OmniSharp) becomes confused. Try restarting OmniSharp. Here are two ways: Close and re-open Visual Studio Code, or Open the Command Pallet and type Restart Omnisharp. OmniSharp tends to become confused if we restore dependencies from the command line instead of from within Visual Studio Code.
Solved (cross checked on Ubuntu 16.04 and CentOS 7): In the VS Code menu, go into File / Preferences / Settings. In the “Search settings” window, type omnisharp.path Click on “Edit in settings.json” link. Add (or edit) like this: “omnisharp.path”: “latest” (from: https://github.com/OmniSharp/omnisharp-vscode/issues/2965)