How fix this error?

[Tycka]

Code:

local elementBackpack = {}

function backPackBack (dataName,oldValue)

if getElementType(source) == "player" and dataName =="rucksak" then

local newValue = getElementData(source,dataName)

if not #newValue or #newValue <= 0 then

setElementData ( source, "rucksak", { 0 } )

return true

end

if not oldValue or not #oldValue then

oldValue = { 0 }

end

if newValue[1] == 0 then

if elementBackpack[source] then

detachElementFromBone(elementBackpack[source])

destroyElement(elementBackpack[source])

elementBackpack[source] = false

end

elseif newValue[1] ~= oldValue[1] then

if elementBackpack[source] then

detachElementFromBone(elementBackpack[source])

destroyElement(elementBackpack[source])

elementBackpack[source] = false

end

local x,y,z = getElementPosition(source)

local rx,ry,rz = getElementRotation(source)

local model = newValue[1]

if model == 1 then

elementBackpack[source] = createObject(3026,x,y,z)

elseif model == 2 then

elementBackpack[source] = createObject(1248,x,y,z)

elseif model == 3 then

elementBackpack[source] = createObject(1575,x,y,z)

elseif model == 4 then

elementBackpack[source] = createObject(1252,x,y,z)

elseif model == 5 then

elementBackpack[source] = createObject(2405,x,y,z)

else

return false

end

if model == 3 then

attachElementToBone(elementBackpack[source],source,3,0,-0.16,0.05,270,0,180)

else

attachElementToBone(elementBackpack[source],source,3,0,-0.225,0.05,90,0,0)

end

end

-- end

if getElementType(source) == "player" and dataName == "helmetOn" then

if getElementData ( source, dataName ) then

local x, y, z = getElementPosition(source)

local helmet = createObject(2052, x, y, z)

setElementData ( source, "helmetObject", helmet )

local skin = getElementModel ( source )

if skin == 73 then

attachElementToBone(helmet, source, 1, 0, 0.02, -0.53, 0, 0, 90)

elseif skin == 287 then

attachElementToBone(helmet, source, 1, 0, 0.01, -0.56, 0, 0, 90)

elseif skin == 18 then

attachElementToBone(helmet, source, 1, 0.015, 0.025, -0.54, 0, 0, 90)

elseif skin == 23 then

attachElementToBone(helmet, source, 1, 0, 0.015, -0.574, 0, 0, 90)

elseif skin == 24 then

attachElementToBone(helmet, source, 1, 0, 0.015, -0.575, 0, 0, 90)

elseif skin == 1 then

attachElementToBone(helmet, source, 1, 0, 0.015, -0.545, 0, 0, 90)

elseif skin == 2 then

attachElementToBone(helmet, source, 1, 0.015, 0.025, -0.59, 0, 0, 90)

else

attachElementToBone(helmet, source, 1, 0, 0.015, -115, 0, 0, 90)

end

else

if isElement ( getElementData ( source, "helmetObject" ) ) then

detachElementFromBone( getElementData ( source, "helmetObject" ) )

destroyElement ( getElementData ( source, "helmetObject" ) )

setElementData ( source, "helmetObject", false )

end

end

end

end

addEventHandler ( "onElementDataChange", getRootElement(), backPackBack )

And I get error:

 SCRIPT ERROR: [DayZ]/DayZ/survivorSystem.lua:1915: 'end' expected (to close 'function' at line 473) near '<eof>' 
ERROR: Loading script failed: [DayZ]/DayZ/survivorSystem.lua:1915: 'end' expected (to close 'function' at line 473) near '<eof>' 

[Chronos]

  
local elementBackpack = {} 
function backPackBack (dataName,oldValue) 
    if getElementType(source) == "player" and dataName =="rucksak" then 
        local newValue = getElementData(source,dataName) 
        if not #newValue or #newValue <= 0 then 
            setElementData ( source, "rucksak", { 0 } ) 
            return true 
        end 
        if not oldValue or not #oldValue then 
            oldValue = { 0 } 
        end 
        if newValue[1] == 0 then 
            if elementBackpack[source] then 
                detachElementFromBone(elementBackpack[source]) 
                destroyElement(elementBackpack[source]) 
                elementBackpack[source] = false 
            end 
        elseif newValue[1] ~= oldValue[1] then 
            if elementBackpack[source] then 
                detachElementFromBone(elementBackpack[source]) 
                destroyElement(elementBackpack[source]) 
                elementBackpack[source] = false 
            end 
             
            local x,y,z = getElementPosition(source) 
            local rx,ry,rz = getElementRotation(source) 
            local model = newValue[1] 
            if model == 1 then 
                elementBackpack[source] = createObject(3026,x,y,z) 
            elseif model == 2 then 
                elementBackpack[source] = createObject(1248,x,y,z) 
            elseif model == 3 then 
                elementBackpack[source] = createObject(1575,x,y,z) 
            elseif model == 4 then 
                elementBackpack[source] = createObject(1252,x,y,z) 
            elseif model == 5 then 
                elementBackpack[source] = createObject(2405,x,y,z) 
            else 
            return false 
            end 
            if model == 3 then 
                attachElementToBone(elementBackpack[source],source,3,0,-0.16,0.05,270,0,180) 
            else 
                attachElementToBone(elementBackpack[source],source,3,0,-0.225,0.05,90,0,0) 
            end 
        end 
    end 
    if getElementType(source) == "player" and dataName == "helmetOn" then 
        if getElementData ( source, dataName ) then 
            local x, y, z = getElementPosition(source) 
            local helmet = createObject(2052, x, y, z) 
            setElementData ( source, "helmetObject", helmet ) 
            local skin = getElementModel ( source ) 
            if skin == 73 then 
                attachElementToBone(helmet, source, 1, 0, 0.02, -0.53, 0, 0, 90) 
            elseif skin == 287 then 
                attachElementToBone(helmet, source, 1, 0, 0.01, -0.56, 0, 0, 90) 
            elseif skin == 18 then 
                attachElementToBone(helmet, source, 1, 0.015, 0.025, -0.54, 0, 0, 90) 
            elseif skin == 23 then 
                attachElementToBone(helmet, source, 1, 0, 0.015, -0.574, 0, 0, 90) 
            elseif skin == 24 then 
                attachElementToBone(helmet, source, 1, 0, 0.015, -0.575, 0, 0, 90) 
            elseif skin == 1 then 
                attachElementToBone(helmet, source, 1, 0, 0.015, -0.545, 0, 0, 90) 
            elseif skin == 2 then 
                attachElementToBone(helmet, source, 1, 0.015, 0.025, -0.59, 0, 0, 90) 
            else 
                attachElementToBone(helmet, source, 1, 0, 0.015, -115, 0, 0, 90) 
            end 
        else 
            if isElement ( getElementData ( source, "helmetObject" ) ) then 
                detachElementFromBone( getElementData ( source, "helmetObject" ) ) 
                destroyElement ( getElementData ( source, "helmetObject" ) ) 
                setElementData ( source, "helmetObject", false ) 
            end 
        end 
    end 
end 
addEventHandler ( "onElementDataChange", getRootElement(), backPackBack ) 

[Tycka]

Code working but when I try drop backpack this code didint work:

function moveRucksakOutOfInventory (itemName) 
    local sack = getElementData ( source, "rucksak" ) 
    if sack and sack[1] ~= 0 then 
        local x,y,z = getElementPosition(source) 
        local item,itemString = getItemTablePosition(itemName) 
        local itemPickup = createItemPickup(item,x+math.random(-1.25,1.25),y+math.random(-1.25,1.25),z,itemString,sack) 
        if elementBackpack[source] then 
            detachElementFromBone(elementBackpack[source]) 
            destroyElement(elementBackpack[source]) 
        end 
        setElementData ( source, "rucksak", { 0 } ) 
    end 
end 

In this line I get error:

if elementBackpack[source] then 

Error:

attempt to index global 'elementBackpack' (a nil value)

[Tycka]

Help