Union not working giving code -6

I’m trying to union a union and a part like this :
image
But when i do the union, this message with the code -6 appears : Something went wrong. CSG returned error code -6. Please file a bug report, preferably with a file containing the problematic object(s).

I’ve tried many things and I’m sure it’s the union the problem, I’ve searched on the DevForum, but I wanted to be sure that I have to create a new union, or if it’s possible to repair this. I’ve put the file with the bugged union. Thanks you for any response
Bugged Union.rbxm (17.9 KB)

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I’ve had this issue before and unfortunately I did I have to redo the union and replace the parts involved. I believe this is because of an error in child data inside one of the parts involved in the union.

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Ok, thank you, I will redo the union or use Blender.

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