Maxscript error when selecting object

[hockey1237]

I'm trying to write a maxscript that will create a custom modifier. That modifier will point the normals of the applied object toward the center of a selected object. Here's my code (screenshot also attached):

plugin modifier MyModifier
name:"My Modifier"
classID:#(0x12345678, 0x87654321)

(
parameters main rollout:params
(
pickedObject type:#node ui:pickedObjectButton
)

rollout params "My Modifier Parameters"
(
button pickedObjectButton "Pick Object" width:100 align:#center

on pickedObjectButton pressed do
(
pickedObject = pickObject prompt:"Select an object to use"
if pickedObject != undefined do update()
)
)

on preRender do
(
if pickedObject != undefined do
(
if (selection.count > 0) do
(
obj = selection[1]
convertToMesh obj
meshData = snapshotasmesh obj
verts = meshData.verts
faces = meshData.faces
normals = #()
for f in faces do
(
p1 = verts[f.x]
p2 = verts[f.y]
p3 = verts[f.z]
norm = normalize (cross (p2 - p1) (p3 - p1))
append normals norm
)
pickedPos = pickedObject.transform.row4
for i = 1 to normals.count do
(
face = getFace obj i
norm = normals[i]
center = (verts[face.x] + verts[face.y] + verts[face.z]) / 3.0
dir = normalize (pickedPos - center)
newNorm = normalize (norm + dir)
setFaceNormal obj i newNorm
)
update obj
)
)
)
)

This creates the modifier and button to select an object, but when i try picking an object i get this:

Select an object to use
-- Error occurred in anonymous codeblock; filename: C:\Users\JSwanson\OneDrive - S-E-A\Desktop\New folder (3)\Maxscripts\Test.ms; position: 504; line: 18
-- MAXScript Rollout Handler Exception:
-- Argument count error: generic apply wanted 1, got 0
-- MAXScript callstack:
-- thread data: threadID:42636
-- ------------------------------------------------------
-- [stack level: 0]
-- In pickedObjectButton.pressed(); filename: C:\Users\JSwanson\OneDrive - S-E-A\Desktop\New folder (3)\Maxscripts\Test.ms; position: 505; line: 18
-- member of: Rollout:params
-- Locals:
-- Externals:
-- params: Rollout:params
-- pickedobject: PluginParameter:pickedobject : $Target_Sphere:TPhotometricLight001 @ [1.824579,67.816650,79.362770]
-- owner: Rollout:params
-- ------------------------------------------------------
-- [stack level: 1]
-- called from top-level

What am I missing?

[istan]

"Argument count error: generic apply wanted 1, got 0" ==> is "update()" not missing an argument?