Oracle : Ошибка ORA-12524

"TNS:listener could not resolve HANDLER_NAME given in connect descriptor"
*Cause: The HANDLER_NAME in the CONNECT_DATA was not found in the listener's
tables for the specified SERVICE_NAME and INSTANCE_NAME.
*Action: Check to make sure that the HANDLER_NAME specified is correct.
*Comment: This error will be returned if the database instance and/or its
service handlers have not been registered with the listener or they have
been registered for different service; the instance may need to be started.

Попробовать перевести

Поискать эту ошибку на форуме