attempt to call field 'SpriteTrail' (a nil value)

this is my code:

function trailme( ply )
	util.SpriteTrail(ply, 0, Color(255,0,0), false, 15, 1, 4, 1/(15+1)*0.5, "trails/plasma.vmt")

concommand.Add( "trailme", trailme )

i am using it in a shop where when you click it calls that but it doesnt work anymore ( used to, dunno what happend tho)

Are you running this server side?

err… i think i am running it shared

if !SERVER then return end

Add that to the start of your function.