Worked for me on a pi4 FWIW.
That library comes from Pillow, so perhaps that didn't install somehow.
Try "pip3 list --verbose" and look for the Pillow line.
Mine looks like:
Pillow 9.4.0
/home/pi/.local/lib/python3.9/site-packages pip
On Tuesday, February 21, 2023 at 5:16:51 AM UTC-8 [email protected] wrote:
> Installed Weewx 5.0.0a17 (which show as a16) with pip3 on a raspberry pi
> with bullseye and configured for Simulator.
>
> Got an error with ImageGenerator, see attachment.
>
> My knowledge of Linux and Python is not much so probably I missed
> something during install.
>
> Luc
>
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