ErrorCS0234 The type or namespace name 'CSharp' does not exist in the namespace 'Microsoft.CodeAnalysis'

I was about to try to make runtime scripting in UI in Unity and after adding all Microsoft.CodeAnalysis and Roslyn.Compilers packages my code still isn't compiling, saying "Error CS0234 The type or namespace name 'CSharp' does not exist in the namespace 'Microsoft.CodeAnalysis' (are you missing an assembly reference?)".What am I missing?