ModuleNotFoundError: No module named 'cvzone' - cvzone

I'm stuck on a probably stupid thing.
I try to run my code with cvzone but I get the following error:
ModuleNotFoundError: No module named 'cvzone'
Although I have installed this package. I use Spyder.
My conf:
python 3.9.1
cvzone 1.5.5
opencv-python 4.6.0.66
Any advice will be helpful.
Cheers

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