lua pls help

Code:

Milk = {}
addhook("join","j_hud")
addhook("leave","l_hud")
addhook("startround","s_hud")
addhook("endround","e_hud")

function j_hud(id)
   Milk[id] = image("gfx/7hud/full.png",555,300,2,id)
   imagealpha(Milk[id],0.5)
end

function l_hud(id)
   freeimage(Milk[id])
end

function s_hud(id)
   Milk[id] = image("gfx/7hud/full.png",555,300,2,id)
   imagealpha(Milk[id],0.5)
end

function e_hud(id)
   freeimage(Milk[id])
end

Error is:
LUA ERROR: sys/lua/autorun/stats.lua:22: bad argument #1 to 'freeimage' (number expected, got nil)
-> [C]: in function 'freeimage'
-> sys/lua/autorun/stats.lua:22: in function
-> in Lua hook 'endround', params: 5

pls?
also i started a new topic because old is more than 2 weeks and idk i no want ban plx :c

555 300 2 HUH DUDE TRY TO Change That

Use this next time.

And here