【Unity】Standard Assetsでエラーが出た時の対処方【error CS0619】

using System;
using UnityEngine;
using UnityEngine.SceneManagement;
using UnityStandardAssets.CrossPlatformInput;

using UnityEngine.UI; // 追加

[RequireComponent(typeof (Image))] // 変更 GUITexture -> Image
public class ForcedReset : MonoBehaviour
{
    private void Update()
    {
        // if we have forced a reset ...
        if (CrossPlatformInputManager.GetButtonDown("ResetObject"))
        {
            //... reload the scene
            SceneManager.LoadScene(SceneManager.GetSceneAt(0).name);
        }
    }
}

using System;
using UnityEngine;

using UnityEngine.UI; // 追加

namespace UnityStandardAssets.Utility
{
    public class SimpleActivatorMenu : MonoBehaviour
    {
        // An incredibly simple menu which, when given references
        // to gameobjects in the scene
        public Text camSwitchButton; // 変更 GUIText -> Text
        public GameObject[] objects;


        private int m_CurrentActiveObject;


        private void OnEnable()
        {
            // active object starts from first in array
            m_CurrentActiveObject = 0;
            camSwitchButton.text = objects[m_CurrentActiveObject].name;
        }


        public void NextCamera()
        {
            int nextactiveobject = m_CurrentActiveObject + 1 >= objects.Length ? 0 : m_CurrentActiveObject + 1;

            for (int i = 0; i < objects.Length; i++)
            {
                objects[i].SetActive(i == nextactiveobject);
            }

            m_CurrentActiveObject = nextactiveobject;
            camSwitchButton.text = objects[m_CurrentActiveObject].name;
        }
    }
}