Bug with compiling local scripts

It does not work to compile either 1 local assembly. The correctness of the scripts themselves is 100% sure. You can take any existing script, download it and try to compile it locally. DotNet himself compiles everything, but the Ensage always shows a compilation error.
What could be the problem?
How to solve it?

Problem solved by installing MSBuild

how and where do I find ms build

in loader press on "?"