“I get numerous visual glitches when playing”
Try to restart the game.
“I ran the app and see only the empty screen and a small error message”
Reinstall the application: delete it, go to the download page and re-install it again. Either the game wasn’t cached properly OR the cache was cleaned. This is known to happen more often on old devices, if you’re using memory cleaning utils or if you didn’t run the game for a long time (which might be a few days, weeks or months, depending on your device).
Updating from v1.8.0.4
App version 1.8.0.4 contains few errors, so updating from it to later versions doesn’t work properly. The key feature to recognize it, it has the ‘full screen’ button right side, it was moved to the left in the next release.
When updating from it, it will probably say about error when caching OR it might invite you to click to refresh the page infinitely. In both cases please close the tab (or all tabs if you have multiple tabs with the app opened) and re-open it in a new tab for changes to apply.
If this doesn’t help (and you still get the ‘full screen’ button right side), try to clear the cache for the app/site and refresh the page. In desktop chrome this requires to refresh the page with Ctrl+F5. In mobile chrome open the page, tap the three-dot menu > Info icon (i) > Cookies and site data, and tap the Delete. For other platforms/browsers google for ‘android chrome clear cache for one site’ (insert your platform and browser) to get the detailed instructions.