Cant compile when i use UCameraComponent in my project

[tcqs]

https://docs.unrealengine.com/zh-CN/Programming/Tutorials/FirstPersonShooter/2/7/index.html
that is the ://docs.unrealengine.com/zh-CN/Programming/Tutorials/FirstPersonShooter/2/7/index.html that is the example which i do with。
if i add
UPROPERTY(VisibleAnywhere)
UCameraComponent* FPSCameraComponent;
it cant compile。