[CLOSED] 2 errors but i don't know exactly (including picture)

Hello everybody! I have a problem, this script isn't made by myself. I've made some changes and I added things. But now I have these problems, I don't even know what they mean... Can somebody help me with this? If you can help, thank you :D

 using System.Collections;
 using UnityEngine;
 
 //List of all the posible gamestates
 public enum GameState
 {
     NotStarted,
     Playing,
     Completed,
     Failed
 }
 
 //Make sure there is always an AudioSource component on the GameObject where this script is added.
 [RequireComponent(typeof(AudioSource))]
 public class GameManager : MonoBehaviour
 {
     //Text element to display certain messages on
     public GUIText FeedbackText;
     
     //Text to be displayed when entering one of the gamestates
     public string GameNotStartedText;
     public string GameCompletedText;
     public string GameFailedText;
     
     //Sounds to be played when entering one of the gamestates
     public AudioClip StartSound;
     public AudioClip FailedSound;
     
     private GameState currentState = GameState.NotStarted;
     //All the blocks found in this level, to keep track of how many are left
     private Block[] allBlocks;
     private Ball[] allBalls;
     
     // Use this for initialization
     void Start()
     {
         //Find all the blocks in this scene
         allBlocks = FindObjectsOfType(typeof(Block)) as Block[];
         
         //Find all the balls in this scene
         allBalls = FindObjectsOfType(typeof(Ball)) as Ball[];
         
         //Prepare the start of the level
         SwitchTo(GameState.NotStarted);
     }
     
     // Update is called once per frame
     void Update()
     {
         switch (currentState)
         {
         case GameState.NotStarted:
             //Check if the player taps/clicks.
             if (Input.GetMouseButtonDown(0)) //Note: on mobile this will translate to the first touch/finger so perfectly multiplatform!
             {
                 for (int i = 0; i < allBalls.Length; i++)
                     allBalls[i].Launch();
                 
                 SwitchTo(GameState.Playing);
             }
             break;
         case GameState.Playing:
         {
             bool allBlocksDestroyed = true;
             
             //Check if all blocks have been destroyed
             for (int i = 0; i < allBlocks.Length; i++)
             {
                 if (!allBlocks[i].BlockIsDestroyed)
                 {
                     allBlocksDestroyed = false;
                     break;
                 }
             }
             
             //Are there no balls left?
             if (FindObjectOfType(typeof(Ball)) == null)
                 SwitchTo(GameState.Failed);
             
             if (allBlocksDestroyed)
                 SwitchTo(GameState.Completed);
             
             switch(currentState)
             {
             case GameState.Failed:
                 Application.LoadLevel("Menu");
             case GameState.Completed:
                 Application.LoadLevel("Level 2");
                 
                 //Check if the player taps/clicks.
                 if (Input.GetMouseButtonDown(0)) //Note: on mobile this will translate to the first touch/finger so perfectly multiplatform!
                     Restart();
                 break;
             }
         }
         }
     }
     
     //Do the appropriate actions when changing the gamestate
     public void SwitchTo(GameState newState)
     {
         currentState = newState;
         
         switch (currentState)
         {
         case GameState.Playing:
             audio.PlayOneShot(StartSound);
             DisplayText("");
             break;
         case GameState.Completed:
             audio.PlayOneShot(StartSound);
             DisplayText(GameCompletedText);
             StartCoroutine(RestartAfter(StartSound.length));
             break;
         case GameState.Failed:
             audio.PlayOneShot(FailedSound);
             DisplayText(GameFailedText);
             StartCoroutine(RestartAfter(FailedSound.length));
             break;
         default:
         case GameState.NotStarted:
             DisplayText(GameNotStartedText);
             break;
         }
     }
     
     //Helper to display some text
     private void DisplayText(string text)
     {
         FeedbackText.text = text;
     }
     
     //Coroutine which waits and then restarts the level
     //Note: You need to call this method with StartRoutine(RestartAfter(seconds)) else it won't restart
     private IEnumerator RestartAfter(float seconds)
     {
         yield return new WaitForSeconds(seconds);
         Restart();
     }
     
     //Helper to restart the level
     private void Restart()
     {
         Application.LoadLevel(0);
     }
 }