sDistz stopped working for no clear reason

[Lapito]

Hello guys. After the last gmod update, my vehicle stopped zooming in and out for no clear reason. I searched everywhere but I don't know how to fix it. Could anyone help me please?

if LocalPlayerIsDrivingShuttle then
		if LocalPlayer():KeyDown(IN_JUMP) then
			LocalPlayer().sDistz=LocalPlayer().sDistz+5
		end
		if LocalPlayer():KeyDown(IN_DUCK) then
			LocalPlayer().sDistz=LocalPlayer().sDistz-5
		end
end

[B]Edit[/B]: I also get this error when I enter it

KeyValues Error: RecursiveLoadFromBuffer:  got EOF instead of keyname in file models/pelican.mdl
mdlkeyvalue, (*prop_data*), 

If you'd need my init or cl_init just ask.