attempt to index nil with 'aimSmooth'?

DISCLAIMER: Code of Xeradev on YT!

I´m currently working on an FPS with the help of the tutorials of the YT Channel Xeradev. When I added sounds, I got an error. "Players.LumpiMagDich.PlayerScripts.Framework - Client:112: attempt to index nil with 'aimSmooth'". The lines I wrote, edited have nothing to do with the line the error gives me, wich I made days ago, and never had problems with. checked if i did something wrong, but there is nothing I found.already red it means that it is indefinined, but i dont know where my problem is.

if isAiming and framework.viewmodel ~=nil and framework.module.canAim then
        local offset = framework.viewmodel.AimPart.CFrame:ToObjectSpace(framework.viewmodel.PrimaryPart.CFrame)
        aimCF = aimCF:Lerp(offset, framework.module.aimSmooth)
        currentSwayAMT = aimSwayAMT
    else
        local offset = CFrame.new()
        aimCF = aimCF:Lerp(offset, framework.module.aimSmooth) <- this is the error line
        currentSwayAMT = swayAMT
    end
end)

how do i fix it? all i red under the video was to change from r6 to r15, which i did to my character, but i really dont know what to do. If the problem is rlly dum, i'm sorry, started with Lua only a week ago, so i need everything to help me. thanks the code I recently added:

if viewmodelFolder:FindFirstChild(Item) then
            framework.viewmodel = viewmodelFolder:FindFirstChild(Item):Clone()
            framework.viewmodel.Parent = camera

            fireAnim = Instance.new("Animation")
            fireAnim.Parent = framework.viewmodel
            fireAnim.Name = "Fire"
            fireAnim.AnimationId = framework.module.fireAnim
            fireAnim = framework.viewmodel.AnimationController.Animator:LoadAnimation(fireAnim)

            fireSound = Instance.new("Sound")
            fireSound.Parent = character.UpperTorso
            fireSound.Name = "Fire"
            fireSound.SoundId = framework.module.fireSound.SoundId
        end

and also

if input.UserInputType  == Enum.UserInputType.MouseButton1 then
        if character and framework.viewmodel and framework.module then
            fireAnim:Play()
            character.UpperTorso.Fire:Play()
        end
    end

end)

if that is important