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Unspecified error in Javascript

URL of experiment:

Description of the problem:

I am trying to run my experiment online and it ran into unkown error.

It worked fine locally. But when I am running online, it runs into unknown error.
I have tried to add the following code to the beginning of the experiment:
Array.prototype.append = .push
But it doesn’t seems to help.
I don’t know what I can do here.

The problem was solved. I have a variable in the python script named as "Number, apparently Javascript does not like that.