It looks like your Blender can’t find the Pillow library, which is needed to generate textures. Here’s how to fix it:
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Install Pillow (only needs to be done once):
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Open Blender.
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Go to Edit → Preferences → System → Open Console (or open a terminal/command prompt).
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Run:
pip install Pillow
If that doesn’t work, try:
python -m pip install Pillow
(Use Blender’s bundled Python if needed:
"<path-to-blender>/4.3/python/bin/python.exe" -m pip install Pillow)
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Restart Blender after installation.
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Try generating the texture again — it should work without errors.