Who can help me?Why I can't user Interface in UE 4.27 version c++?

I used to write “inteface”(it can complie):
image
but now there are problems:


I used the same ways to write inteface,but can’t fail to complie
Who can help me ? :face_exhaling:~~~

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The error message is telling you that an implementation for a non-pure-virtual function Crouch has not been found.

refer to this guide for correctly defining and implementing interface functions: Interfaces in C++ - UE4: Guidebook