During a sequential data operation, the volume specified has been mounted but contains an invalid identifier.
The volume is not used.
Make sure you specified the correct volume for the operation. If a LOADDB operation was being performed on MVS™, the command syntax may be specified by using a ddname or by specifying a device class name. You must use the same method that was used when the database was originally dumped. If you did not, this error message will be displayed. Try loading the data base by using the other method of syntax (ddname).