I built a web app and wants to create an android app that has a webview that shows my web app. After following the instructions from Google Developer to create an app, I successfully installed it on my phone with Android 5.1.1.

However, when I run the app for the first time, the webview shows the message:

Web page not available

The Web page at [Lorem Ipsum URL] could not be loaded as:

net::ERR_CACHE_MISS