os lo pongo por aki, para ver algun entendido en la materia si me podria ayudar y gracias...
INTERNAL EXCEPTION. JAVA.LANG.NULLPOINTEREXCEPTION
y en la consola me pone esto
21:21:47 launcher Preparing to launch minecraft client for 1.12
21:21:48 launcher Checking installations.
21:21:48 launcher Minecraft client 1.12 is ready to start.
21:21:48 launcher Starting!
21:21:48 launcher Using default game log configuration client-1.12.xml (outputs XML)
21:21:51 bhz Setting user: ZULLORD
21:21:52 bhz LWJGL Version: 2.9.2
21:21:53 cet Reloading ResourceManager: Default, Soartex_Fanver prueba.zip
21:21:53 chk Starting up SoundSystem...
21:21:54 chk Initializing LWJGL OpenAL
21:21:54 chk (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
21:21:54 chk OpenAL initialized.
21:21:54 chk Sound engine started
21:21:56 cdn Created: 4096x2048 textures-atlas
21:22:00 bhz ########## GL ERROR ##########
21:22:00 bhz @ Post startup
21:22:00 bhz 1281: Invalid value
21:22:01 bhz ########## GL ERROR ##########
21:22:01 bhz @ Pre render
21:22:01 bhz 1281: Invalid value
21:22:02 com.mojang.realmsclient.client.RealmsClient Could not authorize you against Realms server: Invalid session id