aborting long transaction

Hi I am running ODS 7.23 on HP O/S 10.20. A few users have received some error messages. I looked at the log file and then added 14 more logs. But they got the same errors. I checked onstat -l and they were not full. What else I should look at? Here is the log file info. 10:22:58 Checkpoint Completed: duration was 3 seconds. 10:25:49 Logical Log 291 Complete. 10:25:51 Checkpoint Completed: duration was 1 seconds. 10:25:51 Aborting Long Transaction: tx 0xc26424a0 username: marlynr uid: 112 10:25:54 Process exited with return code 133: /bin/sh /bin/sh -c /usr/informix/etc/log_full.sh 2 23 "Logical Log 291 Complete." "Logical Log 291 Complete." 10:31:05 Checkpoint Completed: duration was 2 seconds. Thaks Thuc