LogScript: Warning: Script Msg: Attempted to access index 1 from array ‘Inventory’ of length 1

Development Programming & Scripting Blueprint
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I got these warning messages. How to fix it?

“LogScript: Warning: Script Msg: Attempted to access index 1 from array ‘Inventory’ of length 1 in ‘/Game/ThirdPersonBP/Blueprints/ThirdPersonCharacter.ThirdPersonCharacter_C’!”

I think it’s something wrong with my pickup item func. inside thirdpersonBP:

TP-PickUPITEM
TP-PickUPITEM1761×902 222 KB

Here are menu and interactions inside ThirdpersonBP(I add only these 2 in event graph):

interactions
interactions1279×772 166 KB

menutp
menutp1901×572 184 KB