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GitHub User: RicardoBelchior

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I am having an error, that gets caught on the browser:
Uncaught TypeError: Object [object Object] has no method 'up'

On the line:

before: content.replace(regexp, new_id)

What might possibly be the cause for this?? I already saw both railcast and source code, but cannot find the solution

I am getting pretty frustrated on this! I would really appreciate some help here! thanks