Reference required to assembly '<assemblyname>' containing the base class '<classname>'
The class is defined in a dynamic-link library (DLL) or assembly that is not directly referenced in your project. The Visual Basic compiler requires a reference to avoid ambiguity in case the class is defined in more than one DLL or assembly.
Error ID: BC30007
To correct this error
Include the name of the unreferenced DLL or assembly in your project references.