The Control-Level entry (positions 7-8) is blank but the previous specification has a Control-Level entry of L0-L9, LR, OR, or AN. In the cases of OR and AN, it is preceded by a specification containing a Control-Level entry of L0-L9 or LR. The blank Control-Level entry defaults to the previous Control-Level entry.
Specify a valid Control-Level entry (positions 7-8). Compile again.
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