We don't support old versions so unfortunately nobody would be looking at your error logs. Internal errors or assertions, are pieces of monitoring code we put in the software to check on the health of the system. A TR25 suggests you have corruption in your database. This may have been caused by a disk failure or network problem during a database write event. You could try performing a database maintenance and also running the archive function to export transactions from 01/01/80 - 01/01/80 to see if the system can remove some of the damaged data. This is not guaranteed though, and it depends on the extent of the damage suffered.