Why is my inventory system suddenly not working?

Okay, I’ve been trying to transfer my 1st Person game from version 4.11 to 4.20. While things seem to work for the most part, one crucial thing which doesn’t seem to have made the transfer unscathed is my inventory system.

Inside my UMG GameHUD blueprint, it keeps saying it has a fatal error, specifically, this: “UE4 Internal Compiler Error: Tried to create a property Inventory but another object (ArrayProperty Inventory) already exists there.”

If I’m reading this right, the engine seems to think I already have an inventory system and that the one I’ve made is – I don’t know – trying to…overwrite(?) it or trample it in some way.

Has anybody come across this before and, if so, how do I fix it?

Hello,

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Thanks