This message occurs if the QuarkXPress Version to be used by Q++Studio is not set.
This is usually caused by uninstalling or reinstalling a new version of QuarkXPress. You will not be able to scan GridTemplates or generate diaries until this problem is solved. Fortunately this is an easy problem to solve.
Solution: Follow the instructions here, to set the version of QuarkXPress to be used with Q++Studio on your PC.