Microsoft.CSharp.Core.targets missing

Question

I am building a webservice project on a TFS2017 Update 3 with build tools 2017. I get the following error

C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\MSBuild\15.0\Bin\Microsoft.CSharp.CurrentVersion.targets(322,5): Error MSB4019: The imported project "C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\MSBuild\15.0\Bin\Roslyn\Microsoft.CSharp.Core.targets" was not found. Confirm that the path in the declaration is correct, and that the file exists on disk.

What steps do I need to take to fix this error?

Answer 1

In my case, opening the existing Solution file (with .sln extension), it installed all the missing dependencies.

Otherwise check for missing target packages at nuget.org manually and install them (e.g. MSBuild.Microsoft.VisualStudio.Web.targets).

Answer 2

If you're coming to this page from google/duckduckgo after trying to figure out why you're getting a similar message in Ubuntu 20.04, maybe this can help: https://askubuntu.com/a/1231973/1073658 (tl;dr apt install mono-roslyn from mono-project's repo)