old code I guess... here are some problems I couldn't figure out

[Lukemanluke]

Assets\scripts\CharacterController2D.cs(27,9): error CS0246: The type or namespace name 'UnityEvent' could not be found (are you missing a using directive or an assembly reference?)

Assets\scripts\CharacterController2D.cs(30,27): error CS0246: The type or namespace name 'UnityEvent<>' could not be found (are you missing a using directive or an assembly reference?)

[jufryananta]

Assets\scripts\CharacterController2D.cs(27,9): error CS0246: The type or namespace name 'UnityEvent' could not be found (are you missing a using directive or an assembly reference?)

Assets\scripts\CharacterController2D.cs(30,27): error CS0246: The type or namespace name 'UnityEvent<>' could not be found (are you missing a using directive or an assembly reference?)

Include "UnityEngine events" in header of your script.

using UnityEngine;
using UnityEngine.Events;