I/O error occurred in log file aa...aa; log message output destination changed to standard error output.

aa...aa: Log file with an error

S: Changes the log message output destination to the standard error output and then continues processing. If the option to output log messages to the console is specified, the console output function is suppressed during output to the standard error output.

O: Contact the OpenTP1 administrator.

Countermeasure: Examine and remove the cause of the I/O error (such that the disk is full).