Attempt to connect failed: Passed value is not a function?

I'm having a bit of trouble seeing what exactly is wrong with my script. It looks completely fine to me but it doesn't work because I can't get the function to fire off because it says that my function (hurtcalc) is apparently not defined.

Here is the code (it's a globalscript) and thank you in advance for helping me.

local Tool = script.Parent.Parent
swing1 = Tool:FindFirstChild("attackState1")
swing2 = Tool:FindFirstChild("attackState2")
aerial = Tool:FindFirstChild("aerialstate")
boxActive = Tool.boxActive

hurt = script.Parent.damage.Value



local function onTouched(hit)
    while boxActive.Value == true do
        if hit.Parent:findFirstChild("Humanoid") then
            hit.Parent["Humanoid"]:TakeDamage(hurt.Value)
            wait()
        end
end

local function hurtcalc()
    if aerial.Value == true then
        hurt.Value = 10
        print "damage 10"
        return hurt.Value
    elseif swing1.Value == true then
        hurt.Value = 20
        print "damage 20"
        return hurt.Value
    elseif swing2.Value == true then
        hurt.Value = 15
        print "damage 15"
        return hurt.Value
        end
    script.Parent.Touched:Connect(onTouched)
    end
end

script.Parent:GetPropertyChangedSignal("Transparency"):Connect(hurtcalc)