已安装Rails gem，但会引发错误

Question

Looks like i have a problem trying to install rails gem.

so i followed the steps from this tutorial , I am using Ubuntu 14.04, rbenv and ruby version 2.2.3

Basically my error is:

apparently I installed rails gem successfully

$ gem install rails -v 4.2.4

-> Successfully installed rails-4.2.4

but whenever i try to use rails command, for example:

$ rails -v

-> bin/rails:9:in require': cannot load such file -- rails/commands (LoadError) from bin/rails:9:in < main >'

And got the same result for any other rails command

I searched everywhere and noone seem to have the same problem as I do. I dont really know what to do now, any help will be really appreciated.

Thanks in advance!!

---

UPDATE: apparently when I enter to a previously created rails app and try to run a rails command, this happens:

Could not find rake-10.5.0 in any of the sources
Run `bundle install` to install missing gems.

so after I run bundle install everything works normally as it should... but if I leave the folder, then I am no longer able to use rails anymore, so I cannot create a new rails app or anything

Answer 1

It sounds like you are sitting inside of a Rails repository already, since there is a bin/rails . So try running bundle install first---and if necessary gem install bundler before that.

Answer 2

I believe rails gem is not installed into your gemset try installing rails gem to gemset with :

sudo gem install rails

If problem still persists then may be your installations are not good & I recommend you to follow this Link to install ruby through rvm and then install rails gem to your gemset it will work.

Open console
Select Edit -> Profile Preferences
Select tab: Title and Command
Check box 'Run command as a login shell'
Restart terminal
and try rvm use 2.2.1 --default

Answer 3

gem install rails --no-rdoc --no-ri