"Out of memory" error when synchronizing on Android

Android app version: 1.0.136

I get this synchronization error when synchronizing with filesystem on Android. No idea why!

This is the message I get:
(also: I have more than 500 notes, why does it show just less than 200?)
Screenshot_20200125-122326|230x500

Anyone with my same issue? Any idea why it happens or possible solutions?