help with errors

Hello In one of my scripts I keep getting the errors BCE0023: No appropriate version of 'UnityEngine.GUI.Button' for the argument list '(UnityEngine.Rect, System.Type)' was found. and BCE0023: No appropriate version of 'UnityEngine.GUI.Label' for the argument list '(UnityEngine.Rect, String, System.Type)' was found. Here is my code

  #pragma strict
         var Friendly_Race = Texture;
         var League = Texture;
         var Tournament = Texture;
         var One_on_One = Texture;
         var Time_Lap = Texture;
         var Stats = Texture;
         var money_GUI_Style = GUIStyle;
         var smaller_option_GUI_Style = GUIStyle;
         var two_smaller_option_GUI_Style = GUIStyle;
         var Career_GUI_Skin = GUISkin;
         
         
         
         function Start () {
     var career : Career_Variables = Career_Variables.GetComponent(Career_Variables);
         }
         
         function Update () {
     
         }
         
         function OnGUI()
         {
                         
             GUI.Label(new Rect(605, 8, 20, 20),  Career_Variables.money.ToString(), money_GUI_Style);
             GUI.Label(new Rect(850, 100, 20, 20),  Career_Variables.Races_Completed.ToString(), smaller_option_GUI_Style);
             GUI.Label(new Rect(1155, 100, 20, 20),  Career_Variables.Fame.ToString(), two_smaller_option_GUI_Style);
             GUI.Label(new Rect(1319, 140, 20, 20),  Career_Variables.Races_won.ToString(), two_smaller_option_GUI_Style);
     
             if (GUI.Button(new Rect(5,170,400,220), Friendly_Race))
             {
                 Application.LoadLevel ("Level Select");
                 }
             if (GUI.Button (new Rect (5,390,400,220), League))
             {
                 Application.LoadLevel ("BuySell_Cars");
                 }
             if (GUI.Button (new Rect (425,390,400,220), Tournament))
             {
                 Application.LoadLevel ("My Garage");
                 }
             if (GUI.Button(new Rect(5,170,400,220), One_on_One))
             {
                 Application.LoadLevel ("Level Select");
                 }
             if (GUI.Button (new Rect (5,390,400,220), Time_Lap))
             {
                 Application.LoadLevel ("BuySell_Cars");
                 }
             if (GUI.Button (new Rect (425,390,400,220), Stats))
             {
                 Application.LoadLevel ("My Garage");
             }
         }

The variables money, Races_Completed, Fame and Races_won are from my script Career_Variables. Im not sure if the errors are stemming from the GUI part of my script or some other part. Thank you in advance