ORA-30757
        Type information could not be accessed.
        
        
        Cause
        Either operations were performed on the newly created subtype while the session was in progress, or the type information was not available in the object cache.
        Action
        Commit changes, end the user session, reconnect, and retry. If the error persists, contact Oracle Support.
        
     
    
    
        ORA-30757
        cannot access type information
        
        
        Cause
        Either a subtype was created and operations performed with this new type while the session was in progress, or the type information was unpinned from the object cache.
        Action
        Commit necessary changes, end the user session, reconnect again and re-try the object operations. If problem persists, contact your Oracle Support representative.
        
     
    
    
        ORA-30757
        cannot access type information
        
        
        Cause
        Either a subtype was created and operations performed with this new type while the session was in progress, or the type information was unpinned from the object cache.
        Action
        Commit necessary changes, end the user session, reconnect again and re-try the object operations. If problem persists, contact your Oracle Support representative.