GENERATED_UCLASS_BODY() error

So I was trying to make a prone setup for my game I could not figure it out so I decide just to do everything that crouch dide and replace some values. After I did all this I went to compile i got these errors in a file programmed by Epic i only added two things such as uint32 bCanProne in a USTRUCT and then in FMovementProperties I asdded a bCanProne(false)

1>D:\Program Files\Epic Games\UE_4.19\Engine\Source\Runtime\Engine\Classes\AI/Navigation/NavigationTypes.h(468): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>D:\Program Files\Epic Games\UE_4.19\Engine\Source\Runtime\Engine\Classes\AI/Navigation/NavigationTypes.h(533): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>D:\Program Files\Epic Games\UE_4.19\Engine\Source\Runtime\Engine\Classes\AI/Navigation/NavigationTypes.h(681): error C2143: syntax error: missing ';' before '<class-head>'
1>D:\Program Files\Epic Games\UE_4.19\Engine\Source\Runtime\Engine\Classes\AI/Navigation/NavigationTypes.h(681): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>D:\Program Files\Epic Games\UE_4.19\Engine\Source\Runtime\Engine\Classes\AI/Navigation/NavigationTypes.h(683): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int