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Crash on setting an interface as function parameter on UMG Widget

Hello, i have a blueprint interface to unify functionality between 2 umg widgets. I have a third um widget that has a method where i want to pass that interface so i can use both umg widgets and have access to the shared methods. But when i do this and try to compile the editor crashes and on Visual Studio i have a variable with the text "It is not possible to express this interface property as a literal value!". How can i fix this? Thank you.

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asked Nov 09 '14 at 12:53 PM in Using UE4

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