Hi Waqar! It's great to see you on the forum. When you get a chance, please introduce yourself here. I'd also encourage you to add a real picture as your avatar because it helps build community!
I know you've already solved this problem, but just so others know, the steps for fixing this is outlined at https://github.com/opendatakit/opendatakit/wiki/Aggregate-AppEngine-Troubleshooting#repairing-a-filled-in-form-submission.