Hello,
It sounds like the most reliable way to play would be to undo the update that caused you to be unable to play. Most people have had success with using an older version of Firefox or Chrome.

This link here should be OS-agnostic for allowing you to to use Chrome, but, again, if this error is popping up immediately after an update, the most surefire way to ensure playability is to undo the update, then go back and see what the update did, line by line to fix the problem.
Thanks!

https://forum-narutoen.oasgames.com/page/show-post-47667-1.html