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-4057 A class cannot be derived from a class with PRIVATE intrinsic functions.

This statement declares a new class with a DERIVED FROM clause. However, the specified base class has one or more intrinsic functions (class constructor, function such as !copy()) that are declared PRIVATE. The intrinsic functions of a base class must be available for calling from within the same functions of the derived class. Private members cannot be called so; therefore, you cannot derive a class from a base class with private intrinsic functions. Make sure that you specified the correct base class, and review its declaration.