There's an error I can't fix

Hello, I made cards in my game but after reading them, it gets stuck by pressing q again. 2. After walking over the papers, I get an error as you can see in the picture. Can you help me fix this?

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I think you forgot to include your picture

Yes, I forgot to add pictures, I have pictures in my new question.

https://answers.unrealengine.com/questions/966930/view.html