Type parameter '<typeparametername>' can only have one constraint that is a class
A constraint list includes more than one class.
A constraint list on a type parameter can accept any number of interfaces but at most one class. A type argument supplied for that type parameter must inherit from that class, and Visual Basic does not support multiple inheritance.
Error ID: BC32047
To correct this error
Select one class and include only that class in the constraint list.
You might be able to define additional type parameters to accommodate the class or classes that you could not include in this constraint list.