In the minified production build of React, we avoid sending down full error messages in order to reduce the number of bytes sent over the wire.
We highly recommend using the development build locally when debugging your app since it tracks additional debug info and provides helpful warnings about potential problems in your apps, but if you encounter an exception while using the production build, this page will reassemble the original error message.
Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined.
If you have a Extension CSS pepper just remove it that's the reason why you got the error if it's not may be another extension o the chrome thz me later