You're getting the error because of too many lines being traced, even though you don't see many.

Try the "actions - > trace" on an activity rule to trace just that activity.  Does that avoid the error?

Or trace your app with the tracer icon but in the settings, try tracing only activity starts and ends, and not all the lines of the activities.  Does that avoid the error?

Try only trying flow events and nothing else.  Does that avoid the error?

Try only tracing interaction starts and ends.  Does that avoid the error?