Qt conflict problem on Mac

PracticalMEEG2025
1

I’m following the instructions provided in https://forum.cuttingeeg.org/t/mne-python-pr25-participants-instructions/984

An error occurred with visualization module pyvistaqt and the kernel crashed when running mne.sys_info() to check modules and dependencies:

├☑ pyvistaqt         0.11.3
objc[3300]: Class RunLoopModeTracker is implemented in both /opt/anaconda3/envs/mne/lib/libQt5Core.5.15.15.dylib (0x168835370) and /opt/anaconda3/envs/mne/lib/libQt6Core.6.9.3.dylib (0x34838d5d0). One of the two will be used. Which one is undefined.
objc[3300]: Class QT_ROOT_LEVEL_POOL__THESE_OBJECTS_WILL_BE_RELEASED_WHEN_QAPP_GOES_OUT_OF_SCOPE is implemented in both /opt/anaconda3/envs/mne/lib/libQt5Core.5.15.15.dylib (0x1688352f8) and /opt/anaconda3/envs/mne/lib/libQt6Core.6.9.3.dylib (0x34838d698). One of the two will be used. Which one is undefined.
objc[3300]: Class KeyValueObserver is implemented in both /opt/anaconda3/envs/mne/lib/libQt5Core.5.15.15.dylib (0x168835320) and /opt/anaconda3/envs/mne/lib/libQt6Core.6.9.3.dylib (0x34838d6c0). One of the two will be used. Which one is undefined.

Looks like different packages are installed with inconsistent qt dependencies that cause a conflict. I did a bit of searching and it seems to be a relatively common issue for Mac, but I didn’t see a consistent way of solving it. For Mac users here, has anyone run into a similar issue and know a stable way to fix it?
Many thanks in advance!

@nschawor @wmvanvliet @christelle.guette

2

Hi @Yunluo !

Have you tried conda remove pyqt qt-main, this way was suggested here: https://mne.discourse.group/t/installation-issues-conflict-between-qt5-and-qt6/10393/6 , that situation looks quite similar to the error you obtained.

Best,
Natalie

4

Thanks Natalie! This is the exact same issue indeed. It does solve the conflicting problem. The original post hinted at issues with plotting at a later stage. I’m not sure if I will run into similar problems later.
I did have the same problem of frozen GUI window discussed here
https://forum.cuttingeeg.org/t/mne-python-gui-freezes-does-not-respond-windows-os/987/2
and I’m trying to find a solution. But I suppose it’s a separate issue then.

  • update: the block = True magic solved it. All good now!
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