Error when clicking on Forecast tab in Group Edition
|Knowledge Article Number||000214417|
If you're clicking on the Forecast tab and getting the following error, it's because you previously had an edition that supported the Forecast tab:
"An internal server error has occurred
Group Edition doesn't have the Forecast feature. If you've previously downgraded from an edition that had this feature, or if you're trial org was a higher edition, that's why you're still seeing the Forecast tab.
This is an expected behavior as Forecast feature is not available in Group Edition.