Invalid request log format on line %1

Error constant SQLE_INVALID_REQUEST_LOG_FORMAT
ODBC 2 State ERROR
ODBC 3 State ERROR
Parameter 1 The line number in the log file.
Severity 16
SQLCODE –999
SQLSTATE WW020
Sybase error code 13493
Probable cause

The request log file format is invalid. The request log may have been created with an older version of the software.