Error BCW0015 and BCW0023 but they both work, how to solve it?

Hi Guys,

I'm working on a Android application in Unity I have wrote a script, that works perfectly however the engine gives me to warning. Can you help me.

 #pragma strict
 
 var async: AsyncOperation = null;
 var TText : TextMesh;
 
 
 private var Tfloar : float;
 private var Tint : int;
 
 private var Once : boolean = true;
 
 private var Text1 : String = "info1";
 private var Text2 : String = "info2";
 private var Text3 : String = "info3";
 private var Text4 : String = "info4";
 private var Text5 : String = "info5";
 private var Text6 : String = "info6";
 private var Text7 : String = "info7";
 private var Text8 : String = "info8";
 private var Text9 : String = "info9";
 private var Text10 : String = "info10";
 private var Text11 : String = "info11";
 private var Text12 : String = "info12";
 private var Text13 : String = "info13";
 private var Text14 : String = "info14";
 private var Text15 : String = "info15";
 private var Text16 : String = "info16";
 private var Text17 : String = "info17";
 private var Text18 : String = "info18";
 private var Text19 : String = "info19";
 private var Text20 : String = "info20";
 
 var TLevelCount : LevelCount = null; 
 
 function Update () 
 {
     
     if (TLevelCount == null) // search for an object call LevelCountOb
     {
         TLevelCount    = GameObject.Find("LevelCountOb").GetComponent(LevelCount);
     }
     
     if (TLevelCount != null) // if he found the object 
     {
         switch (TLevelCount.LevelToLoad)
         {
             case 2:
                 if (Once)
                 {
                     Once = false;
                     Load();
                     TText.text = GetRandom();
                 }
                 break;
             case 3:
                 if (Once)
                 {
                     Once = false;
                     Load();
                     TText.text = GetRandom();
                 }
                 break;
             case 4:
                 if (Once)
                 {
                     Once = false;
                     Load();
                     TText.text = GetRandom();
                 }
                 break;
             case 5:
                 if (Once)
                 {
                     Once = false;
                     Load();
                     TText.text = GetRandom();
                 }
                 break;
             case 6:
                 if (Once)
                 {
                     Once = false;
                     Load();
                     TText.text = GetRandom();
                 }
                 break;
             case 7:
                 if (Once)
                 {
                     Once = false;
                     Load();
                     TText.text = GetRandom();
                 }
                 break;
             case 8:
                 if (Once)
                 {
                     Once = false;
                     Load();
                     TText.text = GetRandom();
                 }
                 break;
         }
     }
         
 }
 
 function Load()// load another level
 {
     if (TLevelCount != null && async == null)
     {
         async = Application.LoadLevelAsync(TLevelCount.LevelToLoad);
         yield async;
     }
 }
 
 function GetRandom(): String // get the information
 {
     var RandoT : int = Random.Range(1, 21);
     
     print("the random number is: " +RandoT);
 
     switch (RandoT)
     {
         case 1:
             return Text1;
             break;
         case 2:
             return Text2;
             break;
         case 3:
             return Text3;
             break;
         case 4:
             return Text4;
             break;
         case 5:
             return Text5;
             break;
         case 6:
             return Text6;
             break;
         case 1:
             return Text1;
             break;
         case 7:
             return Text7;
             break;
         case 8:
             return Text8;
             break;
         case 9:
             return Text9;
             break;
         case 10:
             return Text10;
             break;
         case 11:
             return Text11;
             break;
         case 12:
             return Text12;
             break;
         case 13:
             return Text13;
             break;
         case 14:
             return Text14;
             break;
         case 15:
             return Text15;
             break;
         case 16:
             return Text16;
             break;
         case 17:
             return Text17;
             break;
         case 18:
             return Text18;
             break;
         case 19:
             return Text19;
             break;
         case 20:
             return Text20;
             break;
     }
 
 }

Now t$$anonymous$$s error Assets/Script/PreLoaderBar.js(137,10): BCW0023: WARNING: T$$anonymous$$s method could return default value implicitly. happen on get random

and the second one Assets/Script/PreLoaderBar.js(143,9): BCW0015: WARNING: Unreachable code detected. the Switch.

The code works but I would like to know where is the problem.

Thank you