Hey guy's i need help my minecraft don't work good :/ when i try to go into server it's written java.lang.NullPointerException: group ... I try to reinstal java and minecraft and doesn't work ...
Also i can't go into normal non multiplayer game because it's crashing :/
Please help

The minecraft game output:

16:29:48 launcher Preparing to launch minecraft client for 1.12
16:29:50 launcher Checking installations.
16:29:50 launcher Minecraft client 1.12 is ready to start.
16:29:50 launcher Starting!
16:29:50 launcher Using default game log configuration client-1.12.xml (outputs XML)
16:29:54 bhz Setting user: Dzasta13
16:29:58 bhz LWJGL Version: 2.9.4
16:29:59 cet Reloading ResourceManager: Default
16:30:04 chk Starting up SoundSystem...
16:30:04 chk Initializing LWJGL OpenAL
16:30:04 chk (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
16:30:04 chk OpenAL initialized.
16:30:05 chk Sound engine started
16:30:27 cdn Created: 1024x512 textures-atlas
16:30:34 com.mojang.text2speech.NarratorWindows Narrator library for x64 successfully loaded
16:30:47 bkp Connecting to skyup.pl, 25565
16:30:47 bkp Couldn't connect to server
java.lang.NullPointerException: group
at io.netty.bootstrap.AbstractBootstrap.group(AbstractBootstrap.java:84)
at gw.a(SourceFile:276)
at bkp$1.run(SourceFile:59)
16:33:45 bkp Connecting to skyup.pl, 25565
16:33:45 bkp Couldn't connect to server
java.lang.NullPointerException: group
at io.netty.bootstrap.AbstractBootstrap.group(AbstractBootstrap.java:84)
at gw.a(SourceFile:276)
at bkp$1.run(SourceFile:59)
16:33:51 bhz Stopping!
16:33:51 chk SoundSystem shutting down...
16:33:51 chk Author: Paul Lamb, www.paulscode.com