Troubleshooting Exceptions: System.FieldAccessException

A FieldAccessException exception is thrown when there is an invalid attempt to access a private or protected field inside a class.

Associated Tips

If the access level of a field in a class library has changed, recompile any assemblies that reference that library.
This exception is usually thrown when the access level (Public, Private, etc) of a field in a class library is changed, and one or more assemblies referencing the library have not been recompiled.