GUI error

I’m trying to make a game for my A-level computer science project and I’ve started making the GUI but I get this error when I try to press the buttons.


Would someone please point me in the right direction on how to fix this? Thanks.

You have two collection proxies with the same name.
The name of the collection proxy isn’t the name of a file on disk, but name in properties of the collection:

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Thank you so much