@laurentd, I am not able to replicate this issue.
I have enabled this module...

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@laurentd, I am not able to replicate this issue.

I have enabled this module on both D8 and D9 site and the module got successfully enabled. There is no such error on clearing cache.

D8 version - 8.9.18
D9 version - 9.2.4
Module version link - git clone --branch '2.x' https://git.drupalcode.org/project/image_popup.git

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