FORMAT ERROR 7

This report is given when the format specification in the left argument of system function ⎕FMT is ill-formed.

Example

      'A1,1X,I5'⎕FMT CODE NUMBER
FORMAT ERROR
      'A1,1X,I5'⎕FMT CODE NUMBER
       ^

(The correct specification should be 'A1,X1,I5' .)