This error occurs when you try to generate invoice in TO3000 Version 8 with a template for Version 7. Invoice templates for Version 7 are not compatible with TO3000 Version 8. You can download appropriate invoice templates from sub-pages at: http://www.to3000.com/translation-office-3000/to3000/templates.html

Note: TO3000 7 and 8 are no longer available for purchase. Please consider upgrading to TO3000 3D. You can opder the upgrade here: https://www.to3000.com/order/upgrades-from-previous-versions