I am using Rails 5 API with Devise Token Auth and Angular 2 with Angular2-Token as my front end. I keep getting an error saying "Unpermitted parameters: confirm_success_url, registration" and it fails without saving to the DB saying "422 Unprocessable Entity". I have tried adding these to permitted parameters and then get an error saying "ActiveModel::UnknownAttributeError (unknown attribute 'confirm_success_url' for User.)" and it fails with "500 Internal Server Error". I have removed "confirm_success_url, registration" from permit as I know that this is probably not the solution but am confused on how I should move forward? Sorry if this is a silly question as I am new to some of these technologies but any help moving forward would be appreciated.