What does "class _NSZombie_OS_voucher" implement like ?, So and? I mean?

I got the following message in Xcode when I had both Address Sanitizer and Zombie Objects options in my schema diagnostic options and ran the project:

objc[656]: Class _NSZombie_OS_voucher is implemented in both ?? and ??.
One of the two will be used. Which one is undefined.

      

I turned off Zombie objects and the above message disappeared, but it doesn't come back if I turn Zombie objects back on.

What does the message mean?

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The comment from vaticRite was helpful.

Stop the application and clean up the project.



From the simulator press "simulator" and then "reset content and settings"

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