Unknown error from an entity

[Noya2Coco]

I started coding in Symfony a few months ago, I came across a very inaccurate error and I can't find anyone talking about it on the internet. ChatGPT and other AIs can't find a solution to my problem.
My error is coming from one (or more) ManyToMany relationships of an entity. Here's the error:
AssertionError
assert($mapping instanceof ManyToManyOwningSideMapping)
The problem arises when I want to use my ''Atelier'' entity. I share this entity with you and the others related to it. Thank you in advance for your help.
Entities.zip

[Mat40100]

Hey, this is probably because you have an attribute or annotation JoinColumn or joinTable on the reverse side of the ManyToMany relation