events - Uninitialized Constant Error from Ruby EventMachine Chat Server -

i'm trying build chat server in ruby using eventmanager. needless day, i'm new ruby , feeling little on head current error getting, have no clue means , search doesn't return valuable. here's of logistics-

(ive implemented login , register i'll include those..) user can enter- register username password - registers user login username password - logins user

i'm taking in string of data user sends, splitting array called msg, , acting on data based on msg[0] (as command, register, login, etc)

here code, contained in single file- chatserver.rb (explanation follows):

require 'rubygems' require 'eventmachine'  class server   attr_accessor :clients, :channels, :usercreds, :userchannels    def initialize     @clients     = [] #list of clients connected e.g. [192.168.1.2, 192.168.1.3]     @users       = {} #list of users 'logged in' e.g. [tom, sam, jerry]     @channels    = [] #list of channels          e.g. [a, b, c]     @usercreds   = {} #user credentials hash     e.g. { tom: password1, sam: password2, etc }     @userchanels = {} #users , channels  e.g. { tom: a, sam: a, jerry: b }   end    def start     @signature = eventmachine.start_server("127.0.0.1", 3200, client) |con|       con.server = self     end   end    def stop     eventmachine.stop_server(@signature)      unless wait_for_connections_and_stop       eventmachine.add_periodic.timer(1) { wait_for_connections_and_stop }     end   end    # username exist?     def has_username?(name)     @usercreds.has_key?(name)   end    # user logged in?   def logged_in?(name)     if @users[name] == 1       true     else       false     end   end    # did user enter correct pwd?   def correct_pass?(pass)     if @usercreds[name] == pass       true     else       false     end   end    private      def wait_for_connections_and_stop       if @clients.empty?         eventmachine.stop         true       else         puts "waiting #{@clients.size} client(s) stop"         false       end     end end  class connection < eventmachine::connection   attr_accessor :server, :name, :msg    def initialize     @name = nil     @msg = []   end    # first thing user sees when connect server.   def post_init     send_data("welcome lobby.\nregister or login register/login username password\nor try if stuck!")   end    # start parsing incoming data   def receive_data(data)     data.strip!     msg = data.split("") #split data spaces , throw in array msg[]     if data.empty? #the user entered nothing?       send_data("you didn't type anything! try help.")       return     elsif msg[0] == "register"       handle_register(msg) #send msg handle_register method     else       hanlde_login(msg)    #send msg handle_login method     end   end    def unbind     @server.clients.each { |client| client.send_data("#{@name} has left") }     puts("#{@name} has left")      @server.clients.delete(self)   end    private      def handle_register(msg)       if @server.has_username? msg[1] #user trying register name exists?         send_data("that username taken! choose or login.")         return       else         @name = msg[1] #set name username         @usercreds[name] = msg[2] #add username , password user credentials hash         send_data("ok")  #send user ok message       end     end  end  eventmachine::run   s = server.new   s.start  #start server   puts "server listening" end 

whew, okay, it's beginning, not complicated. since i'm new ruby have feeling i'm not declaring variable or using scope correctly. here's error output:

chatserver.rb:16:in start': uninitialized constant server::client (nameerror) chatserver.rb:110:inblock in ' /users/meth/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2nded/gems/eventmachine-1.0.3/lib/eventmachine.rb:187:in call' /users/meth/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2nded/gems/eventmachine-1.0.3/lib/eventmachine.rb:187:in run_machine' /users/meth/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2nded/gems/eventmachine-1.0.3/lib/eventmachine.rb:187:in run' chatserver.rb:108:in<\main>'

ignore slash in main in last line. line 108 last function- eventmachine::run etc.

any appreciated, if didn't provide enough info let me know.

i think when call eventmachine::start_server need give connection class handler. client not defined anywhere.