An appropriate unit was not available for mounting, or JES3 will not permit the volume to be mounted.
The data set is not scratched.
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 JCL and the SYSOUT output for the job.
Ensure that a unit is available for mounting.
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IDCSA08