Internal error message

Builder
1

OS (e.g. Win10): MacOS Sequoia 15.7.3
PsychoPy version: v2025.2.4beta
Standard Standalone Installation? yes
Do you want it to also run online? yes
What are you trying to achieve?: run experiment

What did you try to make it work?: deleted and redownloaded program. restarted it multiple times

What specifically went wrong when you tried that?: received internal error message

Traceback (most recent call last):
File “/Applications/PsychoPy.app/Contents/Resources/lib/python3.10/psychopy/app/builder/builder.py”, line 3384, in onPluginBtn
File “/Applications/PsychoPy.app/Contents/Resources/lib/python3.10/psychopy/app/plugin_manager/dialog.py”, line 50, in _init_
File “/Applications/PsychoPy.app/Contents/Resources/lib/python3.10/psychopy/app/plugin_manager/plugins.py”, line 260, in _init_
File “/Applications/PsychoPy.app/Contents/Resources/lib/python3.10/psychopy/app/plugin_manager/plugins.py”, line 566, in _init_
File “/Applications/PsychoPy.app/Contents/Resources/lib/python3.10/psychopy/app/plugin_manager/plugins.py”, line 574, in populate
File “/Applications/PsychoPy.app/Contents/Resources/lib/python3.10/psychopy/app/plugin_manager/plugins.py”, line 1326, in getAllPluginDetails
File “/Applications/PsychoPy.app/Contents/Resources/lib/python3.10/psychopy/app/plugin_manager/packageIndex.py”, line 211, in getPluginPackages
TypeError: ‘NoneType’ object is not subscriptable

2

I think this might be to do with opening plugins did it happen when you tried to open plugins and packages? if so there is a temporary solution here Internal error when trying to open the plugins manager - #2 by jon

3

Yes, actually, there’s a second workaround which is to go to your psychopy prefs folder and create the folder cache/appCache then restart the app.

On mac you could do that in a terminal:
mkdir ~/.psychopy3/cache/appCache

On Windows, I’d do the from a files explorer window by putting %appdata% in the folder location and then following down to psychopy3/cache and adding the appCache folder in there

Or download PsychoPy 2026.1.0 where this is solved for you :slight_smile: