This will happen when there is a large amount of requests for reports ahead of yours (20 other reports). Please wait a little bit (30-60 minutes) and check on the status of your report again. If the problem persists for more than 2 hours, please delete the report request entirely and re-run the report request. 

Should you still have troubles, submit a General Service Request

 with a screenshot and we will take a look into what is happening.