How can i fix this command i added to a script?

I'm trying to add a command to a admin script i am working on but it isn't working. Not really sure what i am missing in the code.

if msg:lower():sub(1,4) == "f3x " then
local plrz = GetPlr(plr, msg:lower():sub(5))
for i, v in pairs(plrz) do
coroutine.resume(coroutine.create(function()
if v and v:findFirstChild("Backpack") then
game.Lighting["F3X Tools"]:Clone().Parent = player.Backpack
end 
end))
end
end