My cannon is not working if I walk over the stepped pad. What is the mistake in the script?

Im trying to do a Cannon. If u touch the stepped pad the cannon will shoot. I tried it already without a local function and without the steppedpad and it worked. But I tried to add the stepped pad and it wont work. Can anyone fix the script so it will Work?

 local cannon = script.Parent
local barrel = cannon.Barrel
local fireball = game.ServerStorage.Fireball
local steppedpad = cannon.steppedOn

local function gethit(part)
      local parent = part.Parent
    if game.Players:GetPlayerFromCharacter(parent) then
            local fireballCopy = fireball:Clone()
    fireballCopy.Parent = game.Workspace
    fireballCopy.Position = barrel.Position
    fireballCopy.Velocity = Vector3.new(-100,0,0)
    wait(3)
    end
end

steppedpad.Touched:connect(gethit)

I will tell you more information: the script is inside a model named Cannon. but if you stay on steppedpad then

    fireballCopy.Parent = game.Workspace
    fireballCopy.Position = barrel.Position
    fireballCopy.Velocity = Vector3.new(-100,0,0)
    wait(3)

Won't work, and the fireball won't even spawn! can anyone help me?