Burndown report show empty data
Open Report in Excel in Edit Mode, Allow Data populate set as "trust data connection" in excel
Click on the pivot table data area, then see right side column, see that "Row Labels" box is empty
Drag & drop "Last 4 weeks" from Date--> Sets --> "Last 4 weeks"
Row Labels (This box use to show horizontal bar information in your graph)
Then Save the excel sheet. You will get data in your Burndown report when you refresh your page. J