Operation Extender N is not allowed if the file is not a disk file.
20
Cause . . . . . : The Operation Extender must not be N if the file is not the name of an update-disk file. The N extender is ignored.
Recovery . . . : Remove the Operation-Extender entry of N or change the Factor 2 operand to be the name of an update-disk file or a record from an update disk file. Compile again.
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