Millisecond Forums

Dear Dave, 

I am conducting an online experiment using Inquisit web. So far, it worked for some participants, but for some of them, the program crashes directly in the beginning. The error message is quite cryptic to me, I attached it to the post and hope that you can help. Maybe it has something to do with the fact that the experiment is run by multiple participants simultaneously? 
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Thanks in advance,
Hannah​​​