TOPAZ:
TOPAZ log file default file path:
C:\Program Files\Datatex\Topaz\topaz.log
Make sure that this location is accessable.
If you are using the TOPAZ export option,
in TOPAZ -> SETUP -> PROPERTIES -> NETWORK/FRONT OFFICE,
make sure that you have access to the file path selected.
PABX3:
ALSO SEE: Error writing to log file from the pabx3