Help Error Script MTA

[daffabahy]

[03:16:27] ERROR: [DayZ-MTA]/DayZ/survivorSystem.lua:384: attempt to index globa 
l 'elementWeaponBack' (a nil value) 
[03:19:12] ERROR: [DayZ-MTA]/DayZ/survivorSystem.lua:508: attempt to index globa 
l 'elementWeaponBack' (a nil value) 
[03:20:20] ERROR: [DayZ-MTA]/DayZ/survivorSystem.lua:495: attempt to index globa 
l 'elementWeaponBack' (a nil value) 
  

Can you help me fix the error scripts ? pls help me.

this the full function code.

function weaponSwitchBack(previousWeaponID, currentWeaponID) 
  local weapon1 = getElementData(source, "currentweapon_1") 
  if not weapon1 then 
    return 
  end 
  local ammoData1, weapID1 = getWeaponAmmoType(weapon1) 
  local x, y, z = getElementPosition(source) 
  local rx, ry, rz = getElementRotation(source) 
  if previousWeaponID == weapID1 then 
    if elementWeaponBack[source] then 
      setElementID(player, "elementWeaponBack[source]") 
      detachElementFromBone(elementWeaponBack[source]) 
      destroyElement(elementWeaponBack[source]) 
      elementWeaponBack[source] = false 
    end 
    elementWeaponBack[source] = createObject(getWeaponObjectID(weapID1), x, y, z) 
    setObjectScale(elementWeaponBack[source], 0.875) 
    if elementBackpack[source] then 
      attachElementToBone(elementWeaponBack[source], source, 3, 0.19, -0.31, -0.1, 0, 270, -90) 
    else 
      attachElementToBone(elementWeaponBack[source], source, 3, 0.19, -0.11, -0.1, 0, 270, 10) 
    end 
  elseif currentWeaponID == weapID1 then 
    setElementID(player, "elementWeaponBack[source]") 
    detachElementFromBone(elementWeaponBack[source]) 
    destroyElement(elementWeaponBack[source]) 
    elementWeaponBack[source] = false 
  end 
end 
addEventHandler("onPlayerWeaponSwitch", getRootElement(), weaponSwitchBack) 
function removeBackWeaponOnDrop() 
  if elementWeaponBack[source] then 
    detachElementFromBone(elementWeaponBack[source]) 
    destroyElement(elementWeaponBack[source]) 
    elementWeaponBack[source] = false 
  end 
end 
addEvent("removeBackWeaponOnDrop", true) 
addEventHandler("removeBackWeaponOnDrop", getRootElement(), removeBackWeaponOnDrop) 
function removeAttachedOnDeath() 
  if elementBackpack[source] then 
    detachElementFromBone(elementBackpack[source]) 
    destroyElement(elementBackpack[source]) 
  end 
  if elementWeaponBack[source] then 
    detachElementFromBone(elementWeaponBack[source]) 
    destroyElement(elementWeaponBack[source]) 
    elementWeaponBack[source] = false 
  end 
end 

[EstrategiaGTA]

Where is elementWeaponBack defined?

[GonzaloBuenosAires]

    elseif currentWeaponID == weapID1 then
    detachElementFromBone(elementWeaponBack[source])
    if isElement ( elementWeaponBack [ source ] ) then
    destroyElement ( elementWeaponBack [ source ] )
    end    
    elementWeaponBack[source] = false
  end
end

Copy and paste, and fixing ...