This App Error is keeping me away from graduating - Help


I was accessing my prezi fine and now i keep getting an app error - i dont know what to do


also when I click on the link that was sent out I get this message

The presentation you wanted to join either did not exist, or it has already ended.
Please check the URL and come back!

Thank you for your patience,
The Prezi team

– I dont understand it worked fine the otherday- I didnt end it