Unity Custom Editor window keeps showing up blank

I Can't get my code to show anything in the Editor window I made. I have searched and searched but I can't find the problem. Can you guys figure it out? Btw im using UnityScript.

 #pragma strict
 import System.IO;
 // This script will generate folders
 var numberOfFolders : int = 1;
 var folderName = new Array(numberOfFolders);
 class FolderMaker extends EditorWindow
     {
         @MenuItem("Project Tools/ Create Many Folders")
         
         static function ShowWindow () 
         {
             EditorWindow.GetWindow (FolderMaker);
         }
         
         function OnGui() 
         {
             GUILayout.TextField ("Base Settings");
             numberOfFolders = EditorGUILayout.IntField ("NumberOfFolders", numberOfFolders);    
         }
     }