Project broken with Bundler errors after RVM install

I installed RVM and installed 3 different rubies: 1.8.7, ree, and 1.9.2.

I have a Rails 3.0.9 project that uses 1.8.7.

Now when I try to run the 3.0.9 project, I get this error:

Could not find xml-simple-1.1.0 in any of the sources

However, the following command:

bundle show xml-simple

yields:

/Users/me/.rvm/gems/ruby-1.8.7-p334/gems/xml-simple-1.1.0

Looks right to me. What am I missing here? The application, when running, is clearly not seeing the right path. Yet Bundler, when run at the command line, sees it just fine. I am not certain where these paths are to be se开发者_开发问答t. I am admittedly new to RVM, I installed it because I want to start a new edge project with 1.9.2.

Thank you for any help you can provide.

---

I needed to learn how to create a gemset, then switch to that gemset. You can always check your gem and ruby environment with rvm using:

rvm info

That's what clued me in. Once I "use"d the appropriate gemset where the gem was installed, it worked great.