# 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:** 3\
**Page:** 1

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**Author:** ![kms](https://avatars.discourse-cdn.com/v4/letter/k/41988e/32.png) [@kms](https://discourse.psychopy.org/u/kms)\
**Post date:** [August 2, 2022, 6:15pm UTC](https://discourse.psychopy.org/t/experiment-wont-run-on-my-macos-catalina/30262/1 "2022-08-02T18:15:55Z")

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Hi! need help with setting up experiment - newly installed PsychoPy

macOS Catalina 10.15.7 with windows  
PsychoPy 2021.2.3  
Standalone  
Trying to run the experiment and it fails every time:  
#################  
2022-08-02 20:08:13.288 python[66059:2855925] ApplePersistenceIgnoreState: Existing state will not be touched. New state will be written to (null)

##### Experiment ended.

What is going on here or what do I need to change? Thanks so much in advance for your help.

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**Author:** ![wen](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/wen/32/30795_2.png) [@wen](https://discourse.psychopy.org/u/wen)\
**Post date:** [August 3, 2022, 1:15am UTC](https://discourse.psychopy.org/t/experiment-wont-run-on-my-macos-catalina/30262/2 "2022-08-03T01:15:11Z")

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Maybe you should download the appropriate MAC psychopy

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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.