Can't login, says 'Webpage not available'

I’m having an error trying to login to Hearthstone on Chromebook (Android). I’ve played Hearthstone on here plenty of time before, this problem only recently appeared when I re-installed after having a few issues with the last update.

When I try to login it says the webpage is unavailable, and I get an error
ERR_NO_SUPPORTED_PROXIES. I can’t click anything, have no way to input my details and can only click in which case I return to the loading screen.

Any help with this would be appreciated.