Script to load a text file gives error.

The following script will not load in unity, giving out this error:

 BCE0023: No appropriate version of 'UnityEngine.GUILayout.Label' for the argument list '(UnityEngine.TextAsset)' was found.

Here's the script:

 #pragma strict

 var scrollViewVector : Vector2 = Vector2.zero;
 var TextToDisplay : TextAsset;
 
 function OnGUI () {
     scrollViewVector = GUI.BeginScrollView (Rect (25, 25, 100, 100), scrollViewVector, Rect (0, 0, 400, 400));
     GUILayout.Label(TextToDisplay);
     GUI.EndScrollView();
 }

The script is supposed to load a *.txt file. Any advice on what I'm doing wrong is welcome.