Info Part is not showing in EP

Hi, I have added Info part in List Page and deployed to EP. But, I am getting this error in EP for Info part An unexpected error has occurred. An item with the same key has already been added. Please check the event log or contact your administrator. Its working in AX List page. Any idea?

I have added groupby in Query. Its Perfectly working in list page AX side. If i remove groupby means Info part is showing in EP. Anyone faced this EP is not supporting Groupby!!