Method matches a method in a base class. Specify 'override' or 'hide' to suppress this message.
A method in a derived class that was defined without a version-safe modifier matches a base-class method. Furthermore, the program was compiled with the /versionsafe option. When compiling with the /versionsafe option, every method that matches a base-class method must use a version-safe modifier (either hide or override).
To correct this error
Apply the appropriate version-safe modifier to the method declaration.