s! ASSEMBLY failed because type '%2!s!' in %3!s! assembly '%4!s!' has a static field '%5!s!'. Attributes of static fields ...

%1!s! ASSEMBLY failed because type '%2!s!' in %3!s! assembly '%4!s!' has a static field '%5!s!'. Attributes of static fields in %6!s! assemblies must be marked  readonly in Visual C#, ReadOnly in Visual Basic, or initonly in Visual C++ and intermediate language.