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Ruby on rails with react


Hi, I am very new to programming and need your help…I’ve set up AuthO with React(js framework) and I have a working user sign up/sign in. I am working on a project that combines React and Rails as a backend. When I just run npm start without my rails backend everything works fine but when I run rails s and try to sign up I get a message "No route matches [GET] “/callback”. Can anyone help me to figure out how to set up a route on Rails??? THANK YOU SO MUCH in ADVANCE!!!