201

Explanation
During processing of a WAIT macro, the system found
either: The macro expansion contained an incorrect address for an event
control block (ECB)
The program issuing the WAIT macro was not running under the same
storage protection key as the storage containing the ECB

System action
The system abnormally ends the program that issued
the WAIT macro.

System programmer response
  If the error recurs and the program
is not in error, look at the messages in the job log for more information.
Search problem reporting data bases for a fix for the problem. If
no fix exists, contact the IBM® Support
Center. Provide the program listing and the assembly listing associated
with the job.

Programmer response
Ensure that the ECB address specified is
a valid virtual storage address and that it was not incorrectly modified.
Correct the error.  Run the job again.

Source
Task management