Error Handling and Pop-Up Notifications in OnlyOffice Web Version

As I can see you are still trying to use try...catch block for this purpose. Unfortunately, I’m failing to understand the logic of actions there since the description of try...catch follows quite different path as I’ve mentioned before:

With that said, all asked information about the topic that can be useful for this case I’ve provided in my earlier replies.

Considering the fact that my colleague did review of your plugin once with different problem, if you want to get further support on this, please refer to this post: