error Could not find i18n-0.7.0 in any of the sources

Question

This Saturday (27th, December), I upgraded my project Rails version from version 4.1.5 to version 4.2.0. And I also upgraded the Ruby version from 2.1.2 to 2.1.5.

Today,

Answer 1

I solved the problem.

The problem was, I upgraded the Rails version but I did not upgrade the bin/ folder.

So, to do that, I had to run the following command, and override everything:

$ bundle exec rake rails:update:bin

Thanks.