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undefined method `to' for #<ActionDispatch::Routing::Mapper: (NoMethodError)

I have a rails 5.2 app with the following in config/routes.rb

root to: 'home#index'

Upon running rails s, I get the following error :

undefined method `to' for #

Did you try using the shortcut?

root 'home#index'

And did you already use get to map the request?

get 'home/index'

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