facebook application shows error when cloning code

Iam creating my first facebook application and I am using this Heroku (for hosting my app) for the first time as I was following the procedure provided in https://devcenter.heroku.com/articles/facebook. While trying to fetch my app’s source code, the first step in instruction shows

ssh:connect to host heroku.com port 22: Bad file number  
fatal: The remote end hung up unexpectedly

I am novice in web and facebook application plz help me. Thanks in advance.

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