Fixed the issue- Burn Down Chart shows reporting service error.

Today when I came to the office and looked at our project dashboard, the burn down chart showed the reporting service error. Besides, the burn down chart was not sent to the people who subscribe on the daily basis. I don’t have permission to login to  TFS server and I talked to my manager about this issue.

After looking into the issue, we found out SSAS service stopped for some reason. After restarting SSAS, everything is back to normal.