Xcode debugger doesn't print objects and shows nil, when they aren't

Question

Xcode shows an error when trying to print an object with po , but only for one project.

error: Couldn\'t mater

Answer 1

The solutions here will also fix the bug where you see error: :1:1: error: use of unresolved identifier every time you try to po a variable.

For me the solution was to go to Build Settings and search for Optimization Level and make sure each Debug setting was set to None.