“[something copyWithZone:]: unrecognized selector sent to instance” when using Bindings / Core Data

Question

(self asking and self-answering because I spent hours on the web looking for this, and most of the resources all say \"I solved it in the end\" without giving an explanation

Answer 1

Accidentally faced with this issue.

After a little investigation I found out that the reason was wrong cocoa binding option set on NSTextField-cell object.

The problem was fixed by switch the binding off.