ORA-30757: cannot access type information

admin

ORA-30757: cannot access type information
Cause: Either a subtype wascreated and operations performed with this new type
while the session was in progress, or the type information was unpinned fromthe
object cache.
Action: Commit necessarychanges, end the user session, reconnect again and
re-try the object operations. If problem persists, contact your Oracle Support
representative.