Generate error (NameError)

Rails
1

I get an error when I try to generate a model or controller. Any
suggestions?

$ ruby script/generate
./script/…/config/boot.rb:26: uninitialized constant Gem (NameError)
from script/generate:2:in `require’
from script/generate:2

I used Locomotive 2.0.8 to get RoR on my system. Thx for your help!