Error: Cannot connect to the debugged process at port 51157 in 10s

I'm trying to debug, but is giving the following error:

My gemfile is as follows:

I've followed all the guidelines of the thread and other sites (  and, yet still gives the error.
I use OSX 1.8.2, Ruby 1.9.3-p194 and Rails 3.2.8.

Please, I need your help urgently.


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