Getting an ArityException when I try to call the send-command multimethod

foo.clj

(ns clojure-irc-bot.core)
(import '(java.net Socket))
(import '(java.io InputStream InputStreamReader BufferedReader OutputStream OutputStreamWriter PrintWriter))

(defn connect-to-server [server-name, server-port]
	"Connects to a server and returns a dictionary containing the raw socket, a
	BufferedReader that allows you to read from the socket and a PrintWriter 
	that allows you to write to the socket"
	(let [socket (Socket. server-name server-port)
		reader (BufferedReader. (InputStreamReader. (.getInputStream socket)))
		writer (PrintWriter. (OutputStreamWriter. (.getOutputStream socket)) true)]
		{:socket socket, :reader reader, :writer writer}))

(defn command-type [command-type-name & command-args]
	command-type-name)

(defmulti send-command command-type)

(defmethod send-command :NICK [socket-info nickname]
	(println "Sending:" (str "NICK " nickname))
	(.println (:writer socket-info) (str "NICK " nickname)))

(defmethod send-command :USER [socket-info username realname]
	(.println (:writer socket-info) (str "USER ")))

(defmethod send-command :JOIN [socket-info channel]
	(.println (:writer socket-info) (str "#" channel)))

(defn find-message-type [connection, message]
	message)

(defmulti handle-message find-message-type)

(defmethod handle-message :default [connection message]
	(println message))

(defn event-loop [server-name server-port channel nickname]
	"Connects to the IRC server, joins the specified channel and waits for 
	data. Upon receiving data, it uses the handle-message multimethod to act 
	upon said data"
	(let [connection (connect-to-server server-name, server-port)]
		(send-command :NICK connection "quanticle-bot")
		(send-command :USER connection "quanticle-bot" "quanticle-bot")
		(send-command :JOIN connection "quanticle")
		(loop [data (.readLine (:reader connection))]
			(if (> (count data) 0)
				(handle-message connection data)
				nil)
			(if (.isConnected (:socket connection))
				(recur (.readLine (:reader connection)))
				nil))))