Compilation error (line 3, col 7): The type or namespace name 'UnityEngine' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 5, col 22): The type or namespace name 'MonoBehaviour' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 7, col 12): The type or namespace name 'GameObject' could not be found (are you missing a using directive or an assembly reference?)