I keep getting the save error

[cukkoo]

/Users/--------/Library/Caches/VisualStudio/7.0/MSBuild/1355_1/Microsoft.CSharp.CurrentVersion.targets(5,5): Error MSB4019: The imported project "/Users/--------/Library/Caches/VisualStudio/7.0/MSBuild/1355_1//Microsoft.CSharp.Core.targets" was not found. Confirm that the expression in the Import declaration "\Microsoft.CSharp.Core.targets" is correct, and that the file exists on disk. (MSB4019) (NKDr)

 

 

Building solution NKDr (Debug)
Build started 8/1/2020 7:56:53 PM.
/Users/--------/Library/Caches/VisualStudio/7.0/MSBuild/1355_1/Microsoft.CSharp.CurrentVersion.targets(333,5): error MSB4019: The imported project "/Users/--------/Library/Caches/VisualStudio/7.0/MSBuild/1355_1//Microsoft.CSharp.Core.targets" was not found. Confirm that the expression in the Import declaration "\Microsoft.CSharp.Core.targets" is correct, and that the file exists on disk.

Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:00:00.14

========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Build: 1 error, 0 warnings

even already make code like kopernicus i still get same error

Edited August 1, 2020 by cukkoo