Custom Editor Window not opening after layout crash

Hi Guys, So I made an EditorScript which lets me make items but thats not relevant, the point is that yesterday everything worked just fine and today when I opened Unity a message appeared which said that the layout system crashed or something similar. When the project opened, everyrtime I tried to open the Custom Editor Window I was getting the following error:

UnityException: You are not allowed to call this function when declaring a variable. Move it to the line after without a variable declaration. If you are using C# don't use this function in the constructor or field initializers, Instead move initialization to the Awake or Start function. ItemCreator..ctor ()

Here is my script:

 using UnityEngine;
 using UnityEditor;
 using System.Collections;
 using UnityEngine.UI;
 using UnityEngine.Events;
 using UnityEditor.Events;
 
 public class ItemCreator : EditorWindow
 {
     string m_ItemName;
     float m_AttackDamage;
     float m_BlastDamage;
     float m_AttackSpeed;
     float m_Armor;
     float m_BlastResist;
     float m_MovementSpeed;
 
 
     bool m_HasActive;
 
     Vector2 m_ScrollPos;
     StoreBehaviour m_StoreBehaviour = GameObject.FindGameObjectWithTag("Store").GetComponent<StoreBehaviour>();
 
     [MenuItem("Item Creator/Create Item #i")]
     public static void ShowWindow()
     {
         ItemCreator window = (ItemCreator)EditorWindow.GetWindow (typeof (ItemCreator));
         window.Show();
     }
 
     void OnGUI()
     {
         m_ScrollPos = GUILayout.BeginScrollView(m_ScrollPos, false, false);
         GUILayout.Label("Main Settings", EditorStyles.boldLabel);
         m_ItemName = EditorGUILayout.TextField("Item Name", m_ItemName);
         m_AttackDamage = EditorGUILayout.FloatField("Attack Damage", m_AttackDamage);
         m_BlastDamage = EditorGUILayout.FloatField("Blast Damage", m_BlastDamage);
         m_AttackSpeed = EditorGUILayout.FloatField("Attack Speed", m_AttackSpeed);
         m_Armor = EditorGUILayout.FloatField("Armor", m_Armor);
         m_BlastResist = EditorGUILayout.FloatField("Blast Resistance", m_BlastResist);
         m_MovementSpeed = EditorGUILayout.FloatField("Movement Speed", m_MovementSpeed);
 
         m_HasActive = EditorGUILayout.BeginToggleGroup("Has this Item actives", m_HasActive);
         m_MovementSpeed = EditorGUILayout.FloatField("Movement Speed", m_MovementSpeed);
         EditorGUILayout.EndToggleGroup();
 
         if (GUILayout.Button("Create Item", GUILayout.Width(100f)))
         {
             GameObject m_NewItem = new GameObject(m_ItemName);
             m_NewItem.transform.parent = GameObject.FindGameObjectWithTag("ItemsParent").transform;
             m_NewItem.AddComponent<CanvasRenderer>();
             m_NewItem.AddComponent<Image>();
             m_NewItem.AddComponent<Button>();
             //m_NewItem.GetComponent<Button>().onClick.AddListener(() => GameObject.FindGameObjectWithTag("Store").GetComponent<StoreBehaviour>().SelectItem(m_NewItem));
             //m_NewItem.GetComponent<Button>().onClick.(delegate {GameObject.FindGameObjectWithTag("Store").GetComponent<StoreBehaviour>().SelectItem(m_NewItem);});
             //    UnityAction action = new UnityAction(Func);
             UnityAction m_Action;
 
             //    m_Action = new UnityAction(GetAction);
             m_Action = new UnityAction(m_StoreBehaviour.Test);
             UnityEventTools.AddPersistentListener(m_NewItem.GetComponent<Button>().onClick, m_Action);
             m_NewItem.AddComponent<ItemStats>();
         }
 
         EditorGUILayout.EndScrollView();
 
     }
 
     void GetAction()
     {
         Debug.Log("Wat");
     }
 }

The error points me to line 27. Now The window doesn't even open it just gives me an error but the worst part is that the script works in a new project. I tried many different things like reseting the editor layout changing the syntax of line 27 and 28 but nothing worked

Please help me guys I need to get this working

thanks in advance to the saviour xD, skullbeats1