GUI player menu is not updating values (score, exp, HPs)

GUI player menu is not updating values (score, exp, HPs) after I added Hit Points and Exp to character (name of prefab:Player (yeah, I know - how original)). I'll try to describe everything, but the line that's generates problem (not error - everything is working but not as I designed) is in second line of code beneath point six:

One. (number list makes formating here weird and is messing with code view) I created cube prefab (name:Cube);

Two. I created script that I added to my player (tag: "Player" (PlayerStatus.js):

 public var actualHealth     : int = 100;
 public var maximumHealth     : int = 100;
 public var lives             : int = 3;
 public var actualEXP         : int = 0;
 public var actualLVL        : int = 0;
 
 function ApplyDamage (damage : int)
 {
     actualHealth -=damage;
 
     if (actualHealth<= 0)
     {
         SendMessage("Die");
         lives --;
     }
 }
 
 function ApplyEXP (exp : int)
 {
     actualEXP +=exp;
     
     if(actualEXP >= 100)
     {
         actualEXP -= 100;
         actualLVL++;
     }
 }

Three. I created script that after collision send signal that something happened and attached it to cube prefab (I call it CubeExperience.js - it basically should add exp and take hitpoints by var damage and disappear in thin air):

 public var exp        : int= 45;
 public var damage     : int= 10;
 public var hit         : RaycastHit;
  
 public function OnTriggerEnter (hit : Collider) : IEnumerator 
 {
     if (hit.collider.tag == "Player") 
     {
         hit.collider.SendMessage("ApplyDamage", damage, SendMessageOptions.DontRequireReceiver);
 
         hit.collider.SendMessage("ApplyEXP", exp, SendMessageOptions.DontRequireReceiver);
         Destroy (this.gameObject);
     }
 }

Four. Everything was right as you can see during gameplay that values of PlayerStatus are changing (and it can be added to anything so it nice and everything, but...). There's always a "but(t)"...

Five. I wanted to implement pause function in my HeroMenu.js and I found it easy though I must disabled player (person beghind keyboard not my prefab) controls because when player presses space or arrow keys, after closing menu hero was jumping which could lead to his death:

 public function Update ()  : void
 {
     if (Input.GetKey(KeyCode.M))
     {
         if (b_openMenu == false)
         {
             //pausing game
             Time.timeScale = 0;
             //opening menu
             b_openMenu = true;
             //disabling player movement script
             var playerMovement = GetComponent("CharacterController_2D");
             playerMovement.enabled = false;
         }
     }
 }
 
 private function DoMyWindow    (windowID    : int)    : void
 {
     in_toolbar = GUI.Toolbar(r_tabButton, in_toolbar, s_toolbars, GUI.skin.GetStyle("Tab Button"));
     
     switch (in_toolbar)
     {
         case 0 : //status page
         StatusWindow();
             break;
         case 1 : //items page
         ItemWindow();
             break;
         case 2 : //equipment page
         EquipmentWindow();
             break;
     }
     GUI.DrawTexture (r_hero, t_hero); //Draw our background character texture
     if (GUI.Button (r_closeButton, "", GUI.skin.GetStyle("Exit Button")))
     {
         b_openMenu = false;
         Time.timeScale = 1;
         var playerMovement = GetComponent("CharacterController_2D");
         playerMovement.enabled = true;
     }
     GUI.DragWindow();
 }

Six. After that, full of enthusiasm I was trying to change both HP, EXP and other RPG like values (score, Attack, etc.) values but after I failed in all I just concentrated my efforts on EXP, so I change HeroMenu.js script (that's my GUI script) (I pasted only the crucial/changed parts) cause I didn't want make any trouble, but I can also paste entire script or send it:

         private var playerInfo : PlayersStatus; 
         private var showEXP = playerInfo.actualEXP;     //<-this line
     //generates NullReferenceException: Object reference not set to an instance of 
     //an object. HeroMenu..ctor () (at Assets/HeroMenu.js:110)
         
         private function StatusWindow() : void
         {
             GUI.Box (r_statBox, "");
             GUI.Box (r_weaponBox, "");
             GUI.DrawTexture(r_statTexture1, t_statusBox1);
             GUI.DrawTexture(r_statTexture2, t_statusBox2);
             GUI.DrawTexture(r_skillBox, t_skillBox);
             
             CheckMax();
             
             GUI.Label (r_hpLabel, currentHP.ToString() + "/" + fullHP.ToString(), "Text Amount");
             GUI.Label (r_mpLabel, currentMP.ToString() + "/" + fullMP.ToString(), "Text Amount");
             GUI.Label (r_lvLabel, currentLV.ToString(), "Text Amount");
         
             GUI.Label (r_expLabel, showEXP.ToString(), "Text Amount");
         
             GUI.Label (r_nextLabel, currentNEXT.ToString(), "Text Amount");
             GUI.Label (r_atkLabel, currentATK.ToString(), "Text Amount");
             GUI.Label (r_defLabel, currentDEF.ToString(), "Text Amount");
             GUI.Label (r_agiLabel, currentAGI.ToString(), "Text Amount");
             GUI.Label (r_intLabel, currentINT.ToString(), "Text Amount");
             GUI.Label (r_lucLabel, currentLUC.ToString(), "Text Amount");
             GUI.Label (r_weaponLabel, gui_weaponCon, "Text Item");
             GUI.Label (r_armorLabel, gui_armorCon, "Text Item");
             GUI.Label (r_accessLabel, gui_accessCon, "Text Item");
             GUI.Label (r_skillTexture, gui_skillCon, "Text Item");
         }
         
         private function CheckMax () : void
         {
             fullHP = Mathf.Clamp(fullHP, 0.0, maxHP);
             fullMP = Mathf.Clamp(fullMP, 0.0, maxMP);
             currentHP = Mathf.Clamp(currentHP, 0.0, fullHP);
             currentMP = Mathf.Clamp(currentMP, 0.0, fullMP);
             currentLV = Mathf.Clamp(currentLV, 0.0, maxLV);
             showEXP = Mathf.Clamp(showEXP, 0.0, maxEXP);
             currentNEXT = Mathf.Clamp(currentNEXT, 0.0, maxNEXT);
             currentATK = Mathf.Clamp(currentATK, 0.0, maxATK);
             currentDEF = Mathf.Clamp(currentDEF, 0.0, maxDEF);
             currentAGI = Mathf.Clamp(currentAGI, 0.0, maxAGI);
             currentINT = Mathf.Clamp(currentINT, 0.0, maxINT);
             currentLUC = Mathf.Clamp(currentLUC, 0.0, maxLUC);
         }

Seven. At some point I even add this to Start() in HeroMenu.js

//if(!playerInfo) //{ // playerInfo = GameObject.Find("Player").GetComponent(PlayersStatus); //}

(but I commented this as it was changing nothing)

Eight. I changed many times many variables I even was trying to sending exp : int directly to HeroMenu.js (private function StatusWindow(exp : int)) but it was generating more errors. I hope that I didn't bore you all but I was trying to describe everything for future references.

Nine. Thank you all for your time.