We need a little bit more info for you to help. The URL you posted is an URL on your local machine so a number of things could have happened. Did you already publish your app? Because then your URL should be something like yourappname-sandbox.mxapps.io. Did you make changes to your app like for instance switching to production mode? Because then security might be the reason. Did you give access rights to the content on the page?
So edit your question with what you did, maybe a screenshot of your home page and then we can try to help you further.
Regards,
Ronald