# Name error: PsychoPy will not run experiment

**URL:** <https://discourse.psychopy.org/t/name-error-psychopy-will-not-run-experiment/18891>\
**Category:** Coding\
**Tags:** screen, testing, python3\
**Created:** [December 11, 2020, 1:17am UTC](https://discourse.psychopy.org/t/name-error-psychopy-will-not-run-experiment/18891 "2020-12-11T01:17:35Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Cara\_Davies](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/cara_davies/32/12874_2.png) [@Cara\_Davies](https://discourse.psychopy.org/u/Cara_Davies)\
**Post date:** [December 11, 2020, 1:17am UTC](https://discourse.psychopy.org/t/name-error-psychopy-will-not-run-experiment/18891/1 "2020-12-11T01:17:35Z")

</div>

Hello PsychoPy community,

I recently downloaded PsychoPy in hopes of creating an N-back task. I have located some files online, however when I try and run them on my computer (Mac Book Pro 2019 version, running on Big Sur OS) it raises this name error.

I have python downloaded on my computer (I use it for computer science subjects). I am unsure how to proceed and fix this. Would appreciate any help or advice if people have suffered the same error.

Thank you - Cara

 ![Screen Shot 2020-12-11 at 12.06.31 pm](https://us1.discourse-cdn.com/flex002/uploads/psychopy/original/3X/8/7/879df5b42c5e8d8b008c9a722326b76badf0005e.jpeg)