TTT SWEP help about client/serverside

[JohnnyMapot]

Hello,
I'm currently creating a TTT Swep, but i don't understand why i can't use LocalPlayer()
I tried to add a if CLIENT then, but this litteraly glitch the weapon, the game can't find it in files

hook.Add( "PreDrawHalos", "AddHalos", function()

for k, v in pairs( ents.FindByClass( "prop_*" ) ) do

   if (LocalPlayer:GetPos():Distance( v:GetPos() ) < 100 ) then

          halo.Add({v}, Color( 255, 10, 0 ), 0, 0, 2, true, true )

           end
     end

end)