Hello @esbenkc and welcome to the forum!
Another user has seen a similar error message and fixed the problem by updating NumPy:
Maybe you can try this too.
If it doesn’t help, can you please share the output of
import mne
mne.sys_info()
Thanks!
Richard
cc @rob-luke
Edit: As a general remark, we strongly recommend to follow our official installation instructions, so you’ll end up with a new, dedicated MNE-Python virtual environment with the correct versions of all dependencies.