I need help following this godot tutorial | GDQuest | Page 1

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side by side, left is the video, right is my godot project getting a game breaking error?

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i found the github for the video's code, i copied and pasted it in and it still had this error, how would this function work in the newest build of godot then?

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func _physics_process(delta):
    if(current_state.next_state != null):
        switch_states(current_state.next_state)
        
    current_state.state_process(delta)

func check_if_can_move():
    return current_state.can_move


func switch_states(new_state : State):
    if(current_state != null):
        current_state.on_exit() <-- (The error "Cannot call non-static function "on_exit()" on the class "State" directly")
        current_state.next_state = null
    
    current_state = new_state
    
    current_state.on_enter()

func _input(event : InputEvent):
    current_state.state_input(event)```

#I need help following this godot tutorial