The system detected that the keyword TO or BY is used multiply, or the DO specification contains an illegal symbol.
If the error recurs and the program is not in error, search problem reporting data bases for a fix for the problem. If no fix exists, contact the IBM® Support Center. Provide all printed output and output data sets related to the problem.
Correct any errors in the PL/I source statement and let the syntax checker scan it again. Compile the statement as part of a valid program.
Programming Language/I (PL/I)