. Net core sdk version of 3.0.100 version requires at least msbuild of 16.3.0. The current version is available msbuild 16.1.76.45076. Changes specified in the global. Json in. Net core sdk for the old version needs msbuild version currently available.

        vs2019 version of the problem appears when you open netcore project, as shown below:

 

Identified as necessary to increase the red portion global.json, corresponding to version

{
     “ sdk ”：{
         “版本”：“ 2.1.403 ” }， “ msbuild-sdks ”：{  “ Microsoft.Build.Traversal ”： 16.1.76.45076  } }