# Running Experiment in Builder Does not work

**URL:** <https://discourse.psychopy.org/t/running-experiment-in-builder-does-not-work/39717>\
**Category:** Builder\
**Created:** [April 19, 2024, 7:46pm UTC](https://discourse.psychopy.org/t/running-experiment-in-builder-does-not-work/39717 "2024-04-19T19:46:55Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![nc00](https://avatars.discourse-cdn.com/v4/letter/n/85f322/32.png) [@nc00](https://discourse.psychopy.org/u/nc00)\
**Post date:** [April 19, 2024, 7:46pm UTC](https://discourse.psychopy.org/t/running-experiment-in-builder-does-not-work/39717/1 "2024-04-19T19:46:55Z")

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Hi everyone,

I am trying to run an experiment from the builder, but when I do I get the following error. Could someone please help?

Welcome to PsychoPy2!  
v1.85.6  
Traceback (most recent call last):  
File “/Applications/PsychoPy2.app/Contents/Resources/lib/python2.7/psychopy/app/builder/builder.py”, line 1953, in runFile  
script = self.generateScript(self.exp.expPath)  
File “/Applications/PsychoPy2.app/Contents/Resources/lib/python2.7/psychopy/app/builder/builder.py”, line 2149, in generateScript  
target=target)  
File “/Applications/PsychoPy2.app/Contents/Resources/lib/python2.7/psychopy/app/builder/experiment.py”, line 210, in writeScript  
self.settings.writeWindowCode(script) # create our visual.Window()  
File “/Applications/PsychoPy2.app/Contents/Resources/lib/python2.7/psychopy/app/builder/components/settings/ **init**.py”, line 582, in writeWindowCode  
buff.writeIndentedLines(code % self.params)  
File “/Applications/PsychoPy2.app/Contents/Resources/lib/python2.7/psychopy/app/builder/experiment.py”, line 888, in **str**  
self.valType)  
TypeError: Can’t represent a Param of type color

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<div class="post-metadata">

**Author:** ![wakecarter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/wakecarter/32/5753_2.png) [@wakecarter](https://discourse.psychopy.org/u/wakecarter)\
**Post date:** [April 19, 2024, 9:00pm UTC](https://discourse.psychopy.org/t/running-experiment-in-builder-does-not-work/39717/2 "2024-04-19T21:00:11Z")

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That’s a very old version and won’t necessarily run experiments from more recent versions.

> [@Experiment built on psychopy 2023 cannot run on another computer installed with psychopy 2020](https://discourse.psychopy.org/t/experiment-built-on-psychopy-2023-cannot-run-on-another-computer-installed-with-psychopy-2020/35300):
>
> If this template helps then use it. If not then just delete and start from scratch. OS Win10: PsychoPy version : PsychoPy 2020.2.10 I built a Exp on my coworker’s computer, which installed the newest psychopy(2023), it runs well. But then I failed in running it on mine, which is an old version psychopy(2020.2.10). I didn’t use any fancy component, just some images, keyboards, texts, and loops. Still, it fails. Should I install a new psychopy, too? should I unload the old one before I instal…

I have fixed this before by editing the psyexp file directly but I couldn’t find my post about it now.