[Closed] Scripted modifier with callbacks problem

Why is this throwing an error?

-- Error occurred in anonymous codeblock; filename: C:\Program Files\Autodesk\3ds Max Design 2011\plugins\ProxySwitcher.ms; position: 142; line: 8
-- Syntax error: at name, expected Plugin clause: 
--  In line: 	callbacks.

plugin modifier proxySwitcher
	name:"Proxy Switcher"
	classID:#(609124, 085099)
	extends:Bend 
	replaceUI:true 
	version:1
(
	callbacks.removeScripts id:#proxySwitcher
	
	local switch = true
	local cull = false
	
	parameters main rollout:params
	(
		switchOnRender type:#boolean animatable:false
		ui:switchOnRender default:true
	)
	
	rollout params "Proxy Switcher"
	(
		checkbox switchOnRender "Switch On Render"
	)
	
	fn onPreRender =
	(
		
	)

	callbacks.addScript #preRenderFrame "onPreRender()" id:#proxySwitcher
)

I intend to slap this on a Container to switch out proxies, which Autodesk apparently thought we wouldnt want to do!