is marked as an override but no suitable method found to override

Assets/Scripts/PlayerController.cs(24,33): error CS0115: `PlayerController.FixedUpdateCharacter()' is marked as an override but no suitable method found to override

override 하고자 하는 함수가 상위 클래스에 정의되어 있지 않은 경우에 발생하는 오류