crashlog

[17:16:49] [Client thread/INFO]: Setting user: szerszen4s
[17:16:49] [Client thread/INFO]: (Session ID is token:9cbe26b3dd004c259042345161d120c4:6d9f413f3b464a228ef7f569fe9992a1)
[17:16:56] [Client thread/INFO]: LWJGL Version: 2.9.4
[17:16:58] [Client thread/INFO]: Reloading ResourceManager: Default
[17:16:59] [Sound Library Loader/INFO]: Starting up SoundSystem...
[17:17:00] [Thread-6/INFO]: Initializing LWJGL OpenAL
[17:17:00] [Thread-6/INFO]: (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
[17:17:00] [Thread-6/INFO]: OpenAL initialized.
[17:17:00] [Sound Library Loader/INFO]: Sound engine started
[17:17:14] [Client thread/INFO]: Created: 512x512 textures-atlas
[17:17:25] [Client thread/INFO]: Connecting to Lobby.muttsworldmine.com, 25565
[17:17:25] [Server Connector #1/ERROR]: Couldn't connect to server
java.lang.NullPointerException: group
	at io.netty.bootstrap.AbstractBootstrap.group(AbstractBootstrap.java:80) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
	at ek.a(SourceFile:264) ~[1.8.7.jar:?]
	at awz$1.run(SourceFile:59) [1.8.7.jar:?]