Can't run rails server after accidentally running $ gem update --system

Question

I ran gem update --system thinking it would solve a problem I was having, and now I can\'t run rails server. It won\'t load and instead, I keep getting

Answer 1

Seems like the latest version of Rubygems is buggy.

You just have to revert back to an older version with the following command and everything should work fine :

gem update --system 1.8.24

Answer 2

I had the same issue today. Updating bundler to the latest version fixed the problem:

gem update bundler

And if you are running rbenv

rbenv rehash