C# string as type for AddComponent

Hello,

I am making a custom Editor Window where I can create quests. The tool generates a .cs file using streamwriter. But when I want to assign the script in editor to an object (questGiver) it can't use the string as a type.

 using UnityEditor;
 using UnityEngine;
 using System.Collections;
 using System;
 using System.IO;
 using System.Text;
 
 [ExecuteInEditMode] 
 public class Quest : EditorWindow 
 {
     public static int levelRequirement = 0;
     public static string questName ="Enter Questname Here";
     public static int questExp = 0;
     public static string questGiver = "Quest Giver";
     public static GameObject selectedObject;
     public float secs = 10f;
     public float startVal = 0f;
     public float progress = 0f;
     public class curQuest : MonoBehaviour{};
 
     //QuestStates:
     //    -1    Player is too low level for the quest so the questgiver denies the request
     //    -2    Player activates the quest
     //     -3    Player has not yet finishes the quest
     //    -4     Player has failed the quest but he can start over
     //    -5     Player finishes the quest
 
     public static string questState_1_String = "Can not begin Quest now";
     public static string questState_2_String = "Here is your Quest";
     public static string questState_3_String = "You're not finished yet";
     public static string questState_4_String = "Please try again";
     public static string questState_5_String = "Get your loot";
 
     [MenuItem ("Window/Quests")]
     static void Init () {
         // Get existing open window or if none, make a new one:
         Quest window = (Quest)EditorWindow.GetWindow (typeof (Quest));
         window.Show();
     }
 
     void OnGUI(){
         questName = EditorGUILayout.TextField ("Questname", questName);
         questGiver = Selection.activeTransform ? Selection.activeTransform.name : "Select Quest Giver";
         EditorGUILayout.LabelField("Quest Giver: ", questGiver);
         levelRequirement = EditorGUILayout.IntSlider ("Minimum Level", levelRequirement, 0, 100);
         questState_1_String = EditorGUILayout.TextField ("State 1 Text", questState_1_String);
         questState_2_String = EditorGUILayout.TextField ("State 2 Text", questState_2_String);
         questState_3_String = EditorGUILayout.TextField ("State 3 Text", questState_3_String);
         questState_4_String = EditorGUILayout.TextField ("State 4 Text", questState_4_String);
         questState_5_String = EditorGUILayout.TextField ("State 5 Text", questState_5_String);
         questExp = EditorGUILayout.IntSlider ("Experience Points", questExp, 0, 1000);
 
         if (GUILayout.Button ("Add Quest")) {
             Create ();
 
         }
 
         EditorGUILayout.LabelField ("Compiling:", EditorApplication.isCompiling ? "YES" : "NO");
 
         if (!EditorApplication.isCompiling) {
             if (GUILayout.Button ("Add Quest to Questgiver")) {
                 AddScript ();
             }
         }
     }
 
     static void Create()
     {
         string copyPath = "Assets/Quests/" + questName + ".cs";
         if (File.Exists (copyPath) == false) { // do not overwrite
             using (StreamWriter outfile = 
                        new StreamWriter (copyPath)) {
                 outfile.WriteLine ("using UnityEngine;");
                 outfile.WriteLine ("using System.Collections;");
                 outfile.WriteLine ("");
                 outfile.WriteLine ("public class " + questName + " : MonoBehaviour {");
                 outfile.WriteLine (" ");
                 outfile.WriteLine ("public int levelRequirement = " + levelRequirement + ";");
                 outfile.WriteLine (" ");
                 outfile.WriteLine (" // Use this for initialization");
                 outfile.WriteLine (" void Start () {");
                 outfile.WriteLine (" ");
                 outfile.WriteLine (" }");
                 outfile.WriteLine (" ");         
                 outfile.WriteLine (" ");
                 outfile.WriteLine (" // Update is called once per frame");
                 outfile.WriteLine (" void Update () {");
                 outfile.WriteLine (" ");
                 outfile.WriteLine (" }");
                 outfile.WriteLine ("}");
             }//File written
         }
         AssetDatabase.Refresh ();
     }
         void AddScript(){
         GameObject selectedObject = Selection.activeTransform.gameObject;
         selectedObject.AddComponent<questName>();
     }
 
     void OnInspectorUpdate(){
         Repaint ();
     }
 }

The error is here in:

  void AddScript(){
          GameObject selectedObject = Selection.activeTransform.gameObject;
          selectedObject.AddComponent<questName>();
      }

This is my compiler error:

 Assets/Editor/Quest.cs(97,45): error CS0118: `Quest.questName' is a `field' but a `type' was expected

It can't use questName as a Type for AddComponent. How should I add the script to the GameObject?

Greetings,

GerardM