Ruby on Rails missing Thor

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http://unix.stackexchange.com – When trying to run rails g migration a, I get the following message Thor is not available. If you ran this command from a git checkout of Rails, please make sure thor is installed, and run this command as `ruby script/rails Now few days this did work, and I did check my gemfile and I find thor like this thor (0.16.0) but it doesn't seem to work, what should I do? (HowTos)