Shell – Unknown ruby interpreter version

I have a MacBook Pro, running Mavericks, but I'm not too acquainted with its inner workings. I'm just a humble CS student.

After installing Ruby 1.9.3 and Rails 4.0.0, I get this annoying message every time I open a new terminal window:

Unknown ruby interpreter version (do not know how to handle): textmate.
Could not load ruby textmate.

The message is in bright red, so it worries me. What can I do to fix it/get rid of it?

Thanks!

Edit: The commands I used to install the software are:

sudo xcode-select --install
sudo port -dv selfupdate
rvm install 1.9.3
rvm use 1.9.3 --default
gem install rails -v 4.0.0

Edit 2: As it turns out, the message stopped showing, but I don't know what I did to make it stop. In any case – thanks for reading!