"Table/ File/ Directory does not exist" error

I am receiving an error message like "Table/ File/ Directory does not exist"

Start by checking that you are on the most recent version. You can do this by clicking on the Help/About menu option and comparing with the current version number on our website. Alternatively, click on the Help/Check For Upgrades menu option to see if upgrades exit. If you are not on the most recent version please do the upgrade either via the Help/Check for Upgrades menu option or via our website.

If you are on the most recent version, restart your computer and re-open the program.

If the error still appears, please contact Practical Systems.