I have been developing a Shopify app and have been able to test it locally through ngrok. The next step was to host the app and install it on a development store for testing.
When I host the app (on AWS) and try to install it I am hit with the “No page at this address” error message. I have looked at the other forums and I don’t think the db issue is relevant to this case as this is a first installation on the development store for the dev hosted version of the app.
See the URL of the page which gives you the error. Is it the same page URL you are expecting once someone adds your app? Check whether there are some typo errors or missing characters or whitespaces in the URL.