The error message says that the issue is permissions-related. Have you looked at the location where bundler is trying to install the Gem and listed out the permissions? In Terminal.app, do this:
cd /Users/Diego/.rvm/gems/ruby-2.0.0-p247/
ls -al
Pay particular attention to the letters in front of bin in that listing:
drwxr-xr-x
is what you should see, and the owner and group should be your short account name in Mac OS X.
IF you don't see this, then you may have a botched rvm install. You may have installed as root in your user account, by using sudo before the rvm install command. They warn you not to do that at least 8 times on the installation instructions page.
Anyway, report back what you find, and someone here may be able to help you further. You may just need to step back and remove rvm and then re-install it.
Walter
>
> Best,
> Diego
>
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