When I run this command it fails to integrate because there is a custom document present, but this is what create-next-app created. Even after removing the custom document, there were errors with the lib and components folders not being inside src . It seems to expect the app not to use an src folder even though that's the most common. Also, there's an index.tsx page after calling create-next-app and the homepage of the Makeswift template wasn't even visible. It just loaded forever in the builder. Once I got it all working, there were still warnings in the console.