Trying to convert AutoType GUI Text script to Text mesh (3D text)

(Sorry, maybe my English isn´t perfect)

Hi, I use the AutoType script, but I want to use it for TextMesh, not for GUI Text.

This is the result:

 var currentPosition : int = 0;
 var Delay : float = 0.1;  // 10 characters per sec.
 var Text : String = "";
 var additionalLines : String[];
  
 function WriteText(aText : String) {
     TextMesh.text = "";
     currentPosition = 0;
     Text = aText;
 }
  
 function Start(){
     for ( var S : String in additionalLines )
         Text += "\n" + S;
     while (true){
         if (currentPosition < Text.Length)
             TextMesh.text += Text[currentPosition++];
         yield WaitForSeconds (Delay);
     }
 }

But I get these two errors:

Can you explain what´s wrong?

Thanks in advance.