Office 2016 and Business Intelligence reports

Good morning

So i have been using the Excel 2016 for a few months..maybe a year, to run my Business Intelligence Reports.

I am now unable to run anymore reports as i keep getting an error in excel. The excel keeps disabling the BI Tools add-in and before that, it brings up #Values in reports and an error say "License required"

Any ideas how to fix this?

Thanks

Cathy