Create layers by materials - 3ds max

Great script, thanks for posting it.
Sometimes I have problems with it however. Max pops up an error about the addnode on the last line. I'm not experienced in scripting so any help would be great, thanks.

-- put objects onto layers one layer for each material and name the layer by the material name
-- by Olaf Finkbeiner for www.mainworks.de

layers = #()
obj = #()
for o in geometry where o.material != undefined do (append obj o)
m = scenematerials
c = m.count
for i = 1 to c do (
layername = m[i].name
layer = layermanager.newLayerFromName layername
for o in obj where o.material.name == m[i].name do (layer.addnode o)
)

Hi Mariano,
i just looked for something that does that and could not find it... So i will write it now...

kind regards

Olaf