DFS0921I PSB psbname IS NOT A PSB
Explanation
The named PSB was loaded. Upon examination, it was discovered the PSB was not a valid PSB.
System action
Abend 0921 is issued if batch DL/I was running. ACBGEN processing continues if the ACBGEN utility was being run.
Programmer response
Check the JCL or control statements, or both. Correct the error, and rerun the program.