Disconnected event because of exception, why?

I am new to scripting Lua on ROBLOX. I've been trying to code a Scriptable Camera but it keeps saying, in the Output window, "Disconnected event because of exception. I am testing in 'Solo Play' and Server Play. Why does it keep saying this phrase? Here's the script:

function onTouch(Part)

    run = game:GetService("RunService")
    c = Workspace.Camera
    c.CameraType = "Scriptable"
    Pos = Vector3.new(0, 50, -50)
    Targ = game.Workspace.Dead1.Torso.Position
    Zaxis = -50
    Zoom = 40
for tehloop = 1, 100 do
    if tehloop < 100 then   
    Zoom = Zoom -0.5
    c.FieldOfView = Zoom
    Zaxis = Zaxis +1
    Pos = Vector3.new(0, 50, Zaxis)
    c.CoordinateFrame = CFrame.new(Pos.Targ)
    else
    Zoom = Zoom -1
    c.FieldOfView = Zoom
    end
    run.Stepped:wait(0.1)
end
wait(10)
c.FieldOfView = 50
c.CameraType = "Custom"
end

GUIPBr.Touched:connect(onTouch)

If anyone can help me with this, that would be very helpful. Thank you!