Explanation: The error occurred during processing of an OPEN macro instruction. This system completion code is accompanied by message IEC150I. Refer to the explanation of message IEC150I for complete information about the task that was ended and for an explanation of the return code in register 15.
Programmer Response: Respond as indicated in message IEC150I.
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 JCL and the program listing for the job.
Possibly the DD pointing to your source code is wrong?
This is a common error message that can occur on mainframe systems. S913 is an error that is usually based on authority and what you are are allowed to access. If you are trying to access a dataset which you do not have access to, an S913 error message will be returned to your executing program.