Compiler Error C3661

explicit override list did not find any methods to override

An explicit override specified one or more type names. However, there was no function with the necessary signature in the type(s) that matched the overriding function's signature. If you attempt to override based on type name, there must be one or more virtual functions in the specified type(s) that match the signature of the overriding function.

For more information, see Explicit Overrides.