Seems like you need to debug your app to get to know the exact error on console:
https://websitetoapk.com/docs/debugging-with-chrome.html

You might want to take a look at exitApp() function on the following page:

https://websitetoapk.com/docs/javascript-apis.html

Default Cache : It uses normal caching as usually it occurs in browsers following rules from your caching headers as responded from your web server.

Highly Cached : It caches everything when you load the website for the first time, avoiding if server responds with any kind of caching headers.

@Roteemy , I think you don't understand what it technically means by caching. Caching does not mean that app will store your web content locally.

We are working on an update, your suggestions will make it much more better.

Currently, we would like to take below discussions into consideration as previously suggested by users:
https://websitetoapk.com/forums/324-display-banner-ad-on-specific-pages
https://websitetoapk.com/forums/323-javascript-apis-get-package-name
https://websitetoapk.com/forums/321-keep-the-device-awake-and-prevent-from-sleep

You can scroll down the notification by finger gesture to expand the full contents of the notification.

It is not possible yet until you create an app with local html files.

@Roteemy , Yes, It is compatible. To get assured, you can always try out with Free Edition.

@ContinuumQ , Kindly raise a support ticket with your registered email on link below:
https://websitetoapk.com/support/submit_ticket

This is not possible yet.