SAP Message /SAPCND/GEN_CODE229 - Error calling up method &2 of class &1

Diagnosis Method &SYST-MSGV2& for class &SYST-MSGV1& could not be called. It isprobably not active. System Response Generation is terminated. Procedure Check implementation for method &SYST-MSGV2& (Interface &SYST-MSGV3&)for class &SYST-MSGV1&.