# Jupyter notebook error 'dyld library not loaded: CoreFoundation' after macOS Big Sur upgrade
**URL:** https://discourse.jupyter.org/t/jupyter-notebook-error-dyld-library-not-loaded-corefoundation-after-macos-big-sur-upgrade/6838
**Category:** General
**Created:** [November 20, 2020, 9:04am UTC](https://discourse.jupyter.org/t/jupyter-notebook-error-dyld-library-not-loaded-corefoundation-after-macos-big-sur-upgrade/6838 "2020-11-20T09:04:23Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Yolanda\_W](https://discourse.jupyter.org/u/Yolanda_W)
#### Post date: [November 20, 2020, 9:04am UTC](https://discourse.jupyter.org/t/jupyter-notebook-error-dyld-library-not-loaded-corefoundation-after-macos-big-sur-upgrade/6838/1 "2020-11-20T09:04:23Z")
Hello there,
After upgrading my OS to Big Sur version 11.0.1, I can no longer open up a script through jupyter notebook anymore. There have been [similar problems on stackoverflow](https://stackoverflow.com/questions/64916693/jupyter-notebook-error-dyld-library-not-loaded-corefoundation-after-macos-big).
My error message is
dyld: Library not loaded: /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
Referenced from: /Library/Frameworks/Python.framework/Versions/3.7/Resources/Python.app/Contents/MacOS/Python
Reason: image not found
After researching online for the whole night, I think the problem is that [CoreFoundation is no longer in the file system](https://www.reddit.com/r/MacOSBeta/comments/hfknpa/is_corefoundation_missing_for_everyone_on_big_sur/), so `install_name_tool` does not work either. Does anyone have similar problem or have any suggestion to get around with it? I have tried `brew` and reinstalled conda & jupyter notebook, yet nothing works …
Thank you!!!
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### Author:  [@fernieq](https://discourse.jupyter.org/u/fernieq)
#### Post date: [November 29, 2020, 6:51pm UTC](https://discourse.jupyter.org/t/jupyter-notebook-error-dyld-library-not-loaded-corefoundation-after-macos-big-sur-upgrade/6838/2 "2020-11-29T18:51:09Z")
I just upgraded my mac os to Big Sur as well, and I am trying to run a py file and now it doesn’t work anymore. My error message is:
dyld: Library not loaded: /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
Referenced from: /Library/Frameworks/Python.framework/Versions/3.6/Resources/Python.app/Contents/MacOS/Python
Reason: image not found
Abort trap: 6
I do not know what to do now.
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### Author:  [@Yolanda\_W](https://discourse.jupyter.org/u/Yolanda_W)
#### Post date: [December 13, 2020, 4:42am UTC](https://discourse.jupyter.org/t/jupyter-notebook-error-dyld-library-not-loaded-corefoundation-after-macos-big-sur-upgrade/6838/3 "2020-12-13T04:42:11Z")
Hi @fernieq, you can either upgrade python to python3.9, though some python modules are not compatible with python3.9 yet, or you could switch to other python script editors for now.
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### Author:  [@fernieq](https://discourse.jupyter.org/u/fernieq)
#### Post date: [December 13, 2020, 9:24am UTC](https://discourse.jupyter.org/t/jupyter-notebook-error-dyld-library-not-loaded-corefoundation-after-macos-big-sur-upgrade/6838/4 "2020-12-13T09:24:21Z")
Could you let me know what other python script editors I can use for now?