In the message text:
GTF ignores all options on the line in the response or control statement that contains the error. The system continues processing, but GTF initialization does not continue until the error is corrected. If the error occurred in the GTF parmlib member, the system issues message AHL124I to identify the error source.
In your reply to this message, correct the device number and enter all options on the line again. If the error is in the GTF parmlib member, notify the system programmer.
If a GTF control statement caused the error, correct the device number in the GTF parmlib member and restart GTF.
AHLTPMT
Generalized trace facility (GTF)