Array of arrays, what am i doing wrong?

Hello trying to disable all gear on an AI. Each "class" is an array of gameobjects and i make an array of those arrays to disable ALL classes. But later i need to select a specific class with an index thats why im using an array of arrays. But first i try to understand this "dubble" array. In the start function i set each class in the "allGear" array which is the array of all arrays. But i get an error. What am i doing wrong?

Thanks

     [Header("Equipment for each profession")]
     public GameObject[] noProfession;
     public GameObject[] milita;
     public GameObject[] mason;
     public GameObject[] carpender;
     public GameObject[] archer;
     public GameObject[] scribe;
     public GameObject[] hunter;
 
     public GameObject[][] allGear;
 
     [HideInInspector]
     public int professionIndex = 0;
     //rankIndex
     //1 = hunter
     //2 = mason
     //3 = carpender
     //4 = milita
     //5 = archer
     //6 = scribe
     void Start ()
     {
         allGear [0] = noProfession;
         allGear [1] = hunter;
         allGear [2] = mason;
         allGear [3] = carpender;
         allGear [4] = milita;
         allGear [5] = archer;
         allGear [6] = scribe;
     }
 
     public void UpdateGear (int index)
     {
         //Disable all gear;
         for (int j = 0; j < allGear.Length; j++) {
             for (int i = 0; i < allGear [j].Length; i++) {
                 allGear [j][i].SetActive(false);
             }
         }
     }