Get Random nickname from server for a giveaway or something got error

[LeShoxx]

Hello i dont know why its keeping says error can anyone help me?

concommand.Add( "getrandom", getrandom )

function getrandom ( )
local rply = math.random(1, #player.GetAll())
	for _, ply in pairs( #rply ) do
		print( ply:Nick() .. ", " .. ply:SteamID() .. "\n" )
		PrintMessage( HUD_PRINTTALK, ply:Nick() .. ", " )
end
end

[ERROR] lua/rand.lua:13: bad argument #1 to 'pairs' (table expected, got number)
  1. pairs - [C]:-1
   2. unknown - lua/rand.lua:13
    3. unknown - lua/includes/modules/concommand.lua:54

[SneakySquid]

local ply = player.GetAll()[rply]