Need Help: Error code: Out of Memory

This is an issue on your end. Your computer ran out of ram and bubble crashed. This happens to me relatively often as I tend to keep a ton of tabs open in Chrome. Maybe at the point bubble crashed you had another cpu intensive process running at the same time. Bubble has been working on reducing the memory that the editor uses for exact reasons like this. They talked about it in a recent feature release
[Experimental Feature] Edit-mode performance enhancement - Announcements / New features - Bubble Forum

Also similar question here:
Bubble editor keep crashing - Need help - Bubble Forum