error CS0012: The type 'Enum' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'.

[apatuka]

Greetings

I have the following problem when i compile:

Error CS0012: The type 'Enum' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'.

But i already installed the NETStandard library 2.0 through NuGet and reloaded the project, it appears on References but still giving this error.