How can I remove a gem from my Rails 3 project without getting this really strange Bundle error?

The error is: You have modified your Gemfile in development but did not check the resulting snapshot (Gemfile.lock) into version control

WHAT VERSION CONTROL? Why/how does Bundle know anything about version control? 开发者_StackOverflow I just removed a line from my Gemfile. Am I not supposed to do that?

Do rm -rf .bundle && bundle install from your project root.