[Ruby on Rails] NoMethodError undefined method `devise_for'error resolution

NoMethodError undefined method How to deal with the error of `devise_for'...

I got an error like this when I tried to refresh the browser and check the contents after the implementation was completed ... スクリーンショット 2020-05-17 21.05.04.png If you wondered why you got an error even though there was no problem even if you confirmed the mistake, you can solve it by ** restarting the server **! It's a simple error ^ _ ^

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