# Experiment won't run on my macOS Catalina

**URL:** <https://discourse.psychopy.org/t/experiment-wont-run-on-my-macos-catalina/30262>\
**Category:** Builder\
**Created:** [August 2, 2022, 6:15pm UTC](https://discourse.psychopy.org/t/experiment-wont-run-on-my-macos-catalina/30262 "2022-08-02T18:15:55Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![mh105](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/mh105/32/41792_2.png) [@mh105](https://discourse.psychopy.org/u/mh105)\
**Post date:** [May 16, 2024, 5:24am UTC](https://discourse.psychopy.org/t/experiment-wont-run-on-my-macos-catalina/30262/3 "2024-05-16T05:24:17Z")

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There have been several posts on this…

> [@Error -- ApplePersistenceIgnoreState: Existing state will not be touched. New state will be written to (null)](https://discourse.psychopy.org/t/error-applepersistenceignorestate-existing-state-will-not-be-touched-new-state-will-be-written-to-null/23964/4):
>
> Just type in terminal window
> 
> ```auto
> defaults write org.opensciencetools.psychopy ApplePersistenceIgnoreState NO
> 
> ```
> 
> and it should be all set.

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_[View the full topic](https://discourse.psychopy.org/t/experiment-wont-run-on-my-macos-catalina/30262)._