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sm5 problem

Hi i downloaded from ue4 market two things and combined it like in tutorial. Whenn pressing apply, this happens:
What to do? using 4.25

EDIT: The tutorial just sais i have to add this fluidinteraction box (in picture) between and connect.
Crazy thing is no matter what i do in this blueprint those error repeat. I mean: The Bleprint is about a Material and it works. but when i open the Blueprint and even move the grey box a little bit and click apply, the errors come up and the material doesnt work anymore.

Do you need to fill those parameters in?

The tutorial just sais i have to add this fluidinteraction box (in picture) between and connect.
Crazy thing is no matter what i do in this blueprint those error repeat. I mean: The Bleprint is about a Material and it works. but when i open the Blueprint and even move the grey box a little bit and click apply, the errors come up and the material doesnt work anymore.