BCE0020: An instance of type 'UnityEngine.WWW' is required to access non static member 'text'.

I am trying to get a line of text from a web page and match it with a line in a .txt file in the game here is the code I have so far import System.IO; var fileName = "version.txt";

 var url = "https://googledrive.com/host/0By0eZ3sqrGD2b1FCSDZBamNTZlU/";
 
  
 function Start () 
 {
 
     //read txt file -------------------------------------------------------
     var sr = new StreamReader(Application.dataPath + "/" + fileName);
     var fileContents = sr.ReadToEnd();
     sr.Close();
  
     var lines = fileContents.Split("\n"[0]);
     for (line in lines) 
     {
         print (line);
     }
     //----------------------------------------------------------------------
     
     
     // read web page---------------------------------------------------------
          // Start a download of the given URL
         var www : WWW = new WWW (url);
         // Wait for download to complete
         yield www;
         
         var version = WWW.text;
         Debug.Log(version);
     //--------------------------------------------------------------------------    
 
 }

this code gives me the error BCE0020: An instance of type 'UnityEngine.WWW' is required to access non static member 'text'.

on the line "`var version = WWW.text;`" am I using WWW.text right? there wasent any example code in the manual