#1 by YefimR

I have run an experiment - it worked smoothly.  After about half an hour after the experiment ended, I entered my app (that worked correctly), but when I clicked on the "data" tab, I got 500 error message - looking at the logs, it showed "Incorrect padding" message (all screens attached). Any idea what might be the issue? 

I still can enter my "app" but not the "data" or "session" tabs

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#2 by Chris_oTree

It seems that some data stored in participant vars is corrupted. Can you add chris@otree.org as a collaborator on the Heroku app so i can take a look?

#3 by YefimR

Thanks for your response Chris. I have added you.