Not supported event definition for an intermediate throw event

I was wotking on my Diagram, and all of when I tried to save it, got an error message saying that one or multiple errors had occurred.

Then I tried going to the file page and saving it from there, but got the message that is written in this topic's title.

I tried opening a new diagram to copy the troublesome one to a new blank slate, but I can't get to the page where you see multiple diagrams, it just won't work.

The validate button also does nothing.

The process is as on the image file attached to this topic.

It is kinda blurry and the process is written in portuguese but I don't think that will hinder anyones ability to diagnose the issue.