auto scale camera error when upgrading unity4.3 into 4.5

hi guys , im using this script in unity 4.3 it's work , and i decided to upgrade into unity 4.5 . suddenly a new error show up

     // Use this for initialization
     void Start () 
     {
         // set the desired aspect ratio (the values in this example are
         // hard-coded for 16:9, but you could make them into public
         // variables instead so you can set them at design time)
         float targetaspect = 16.0f / 9.0f;
     
         // determine the game window's current aspect ratio
         float windowaspect = (float)Screen.width / (float)Screen.height;
     
         // current viewport height should be scaled by this amount
         float scaleheight = windowaspect / targetaspect;
     
         // obtain camera component so we can modify its viewport
         Camera camera = GetComponent<Camera>();
     
         // if scaled height is less than current height, add letterbox
         if (scaleheight < 1.0f)
         {  
             Rect rect = camera.rect;
     
             rect.width = 1.0f;
             rect.height = scaleheight;
             rect.x = 0;
             rect.y = (1.0f - scaleheight) / 2.0f;
             
             camera.rect = rect;
         }
         else // add pillarbox
         {
             float scalewidth = 1.0f / scaleheight;
     
             Rect rect = camera.rect;
     
             rect.width = scalewidth;
             rect.height = 1.0f;
             rect.x = (1.0f - scalewidth) / 2.0f;
             rect.y = 0;
     
             camera.rect = rect;
         }
     }

SS using unity 4.3

SS using unity 4.5

so what is wrong ??