1Q18I READER/WRITER ROUTINE CANNOT BE STARTED WITH DEVICE cuu
Cause: This is not a valid device address for this DOS/VS supervisor, or
It is not a valid device type for the reader or writer routine specified in the preceding S
command, for example, starting a punch writer routine on 00E, where 00E is the device
address of the printer, or
The device is down, or it is already being used by another reader/writer routine.
System Action: The S command for the reader or writer routine is ignored.
Programmer Action: none.
Operator Action: Re-enter the S command with the correct device address.
Used with Courtesy and Permission of International Business Machines, Inc.