Error al abrir multijugador en 17w16b

22:22:29	launcher	Preparing to launch minecraft client for 17w16b
22:22:30	launcher	Checking installations.
22:22:30	launcher	Minecraft client 17w16b is ready to start.
22:22:30	launcher	Starting!
22:22:31	launcher	Using default game log configuration client-1.12.xml (outputs XML)
22:22:33	bgz	Setting user: JotaroStardust
22:22:35	bgz	LWJGL Version: 2.9.4
22:22:36	cdw	Reloading ResourceManager: Default
22:22:37	cgi	Missing sound for event: minecraft:block.end_portal.spawn
22:22:37	cgi	Missing sound for event: minecraft:block.end_portal_frame.fill
22:22:37	cgi	Missing sound for event: minecraft:block.note.bell
22:22:37	cgi	Missing sound for event: minecraft:block.note.chime
22:22:37	cgi	Missing sound for event: minecraft:block.note.flute
22:22:37	cgi	Missing sound for event: minecraft:block.note.guitar
22:22:37	cgi	Missing sound for event: minecraft:block.note.xylophone
22:22:37	cgi	Missing sound for event: minecraft:entity.boat.paddle_land
22:22:37	cgi	Missing sound for event: minecraft:entity.boat.paddle_water
22:22:37	cgi	Missing sound for event: minecraft:entity.bobber.retrieve
22:22:37	cgi	Missing sound for event: minecraft:entity.endereye.death
22:22:37	cgi	Missing sound for event: minecraft:entity.illusion_illager.ambient
22:22:37	cgi	Missing sound for event: minecraft:entity.illusion_illager.death
22:22:37	cgi	Missing sound for event: minecraft:entity.illusion_illager.hurt
22:22:37	cgi	Missing sound for event: minecraft:entity.player.hurt_drown
22:22:37	cgi	Missing sound for event: minecraft:entity.player.hurt_on_fire
22:22:37	cgi	Starting up SoundSystem...
22:22:37	cgi	Initializing LWJGL OpenAL
22:22:37	cgi	(The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
22:22:38	cgi	OpenAL initialized.
22:22:38	cgi	Sound engine started
22:22:48	ccq	Created: 1024x512 textures-atlas
22:28:31	brh	Can't ping eu.oc.tc: Disconnected
22:28:32	bgz	Reported exception thrown!
f: Ticking screen
	at bgz.t(SourceFile:1606)
	at bgz.ax(SourceFile:964)
	at bgz.a(SourceFile:404)
	at net.minecraft.client.main.Main.main(SourceFile:123)
Caused by: java.lang.NullPointerException
	at io.netty.bootstrap.Bootstrap.checkAddress(Bootstrap.java:358)
	at io.netty.bootstrap.Bootstrap.doResolveAndConnect(Bootstrap.java:180)
	at io.netty.bootstrap.Bootstrap.connect(Bootstrap.java:162)
	at io.netty.bootstrap.Bootstrap.connect(Bootstrap.java:143)
	at brh.b(SourceFile:241)
	at brh.a(SourceFile:45)
	at brh$1.a(SourceFile:144)
	at ge.l(SourceFile:381)
	at brh.a(SourceFile:254)
	at bme.e(SourceFile:115)
	at bgz.t(SourceFile:1596)
	... 3 more