This error will occur when the topaz log file is to big to display on screen.
You can use a text editor(which can handle huge files) to open it. The filepath
for the log file is displayed in TOPAZ under [SETUP -> PROPERTIES -> LOG FILE]',
in the 'Log File' section.
If you want to view the logs in TOPAZ, you need to purge the entries to see the
last 30 entries. ALSO SEE: How do I purge/clean the Topaz log file?