There was no IEFRDER DD statement supplied in the JCL or the diskette writer was started to a device that was not a 3540.
The diskette writer is ended.
Specify a 3540 when the 3540 External Writer is started.
The system programmer should be sure that diskette writer procedures specify a 3540 as the device for the IEFRDER DD statement.
DFSMSdfp
2,7
7