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Hi,
From what I can see you have a NullReferenceException in your own code in ArchiveStructureInitializationModule. My guess is that e.Page is null. So add a null check for that.
Oh my goodness, I can't beileve I missed that in the error message itself... Thank you so much, always good to have an extra pair of eyes look at this stuff!
When a user copy and pastes any object be it Page/Block/Media in the content tree, we get the following error in the console log: