ruby error with workling

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Bids
10
Avg Bid (USD)
$41
Project Budget (USD)
$30 - $250

Project Description:
Hello , i have a problem with ruby and Rails. I must use workling in my ruby script but i have this error:

uninitialized constant ActiveSupport::CoreExtensions (NameError)

What append? I think that is a stupid problem. Bid if you can help me.

Regards

Skills required:
Ruby on Rails
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