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i cant call widget variables From hud blueprint

I created all the widgets in hud blueprint and out them into variables (picture 1) then i wanted to call them from the hub and put them in a variable created in this widget blueprint, (picture 2) these errors showed (picture 4) but when i want to call them and not put them in variables it works(Picture 3). WHY?

Product Version: UE 4.21
screenshot-361.png (368.9 kB)
screenshot-363.png (487.4 kB)
screenshot-364.png (500.3 kB)
screenshot-365.png (187.7 kB)
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asked Dec 15 '18 at 08:21 PM in Blueprint Scripting

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