It is possible to get a message "cannot find template" when trying to create a DataGroup report. This occurs when open in DataGroup Explorer.
The issue is caused when the schedule report templates cannot be found.
Users need access to their dataset datagrouplayouts folder which is where the templates are stored for the reportable types of elements.
C:\ProgramData\Bentley\AECOsimBuildingDesigner V8i Ss4\WorkSpace\BuildingDatasets\Dataset_US\datagrouplayouts\ Location of DataGroup System Schedule Layouts. (DG_SCHEDULE_LAYOUT_PATH)