cuando intento acceder a un servidor me aparece esto:

Completely ignored arguments: [–nativeLauncherVersion, 307]
[17:45:13] [Client thread/INFO]: Setting user: JusThon
[17:45:15] [Client thread/INFO]: LWJGL Version: 2.9.4
[17:45:16] [Client thread/INFO]: Reloading ResourceManager: Default
[17:45:17] [Sound Library Loader/INFO]: Starting up SoundSystem…
[17:45:18] [Thread-5/INFO]: Initializing LWJGL OpenAL
[17:45:18] [Thread-5/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
[17:45:18] [Thread-5/INFO]: OpenAL initialized.
[17:45:18] [Sound Library Loader/INFO]: Sound engine started
[17:45:24] [Client thread/INFO]: Created: 1024×512 textures-atlas
[17:45:56] [Client thread/INFO]: Connecting to play.cubecraft.net., 25565
[17:45:59] [Client thread/INFO]: [CHAT]
[17:46:03] [Client thread/INFO]: [CHAT] —————————–
[17:46:03] [Client thread/INFO]: [CHAT]
[17:46:03] [Client thread/INFO]: [CHAT] Welcome to CubeCraft Games!
[17:46:03] [Client thread/INFO]: [CHAT] Website: cubecraft.net
[17:46:03] [Client thread/INFO]: [CHAT] Store: store.cubecraft.net
[17:46:03] [Client thread/INFO]: [CHAT]
[17:46:03] [Client thread/INFO]: [CHAT] —————————–
[17:46:04] [Client thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
at h.a(SourceFile:47) [1.11.jar:?]
at beq.av(SourceFile:959) [1.11.jar:?]
at beq.a(SourceFile:395) [1.11.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:124) [1.11.jar:?]
Caused by: java.lang.NullPointerException
at bnm.a(SourceFile:468) ~[1.11.jar:?]
at fv.a(SourceFile:67) ~[1.11.jar:?]
at fv.a(SourceFile:14) ~[1.11.jar:?]
at fo$1.run(SourceFile:13) ~[1.11.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
at h.a(SourceFile:46) ~[1.11.jar:?]
… 3 more
[17:46:06] [Client thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
at h.a(SourceFile:47) [1.11.jar:?]
at beq.av(SourceFile:959) [1.11.jar:?]
at beq.a(SourceFile:395) [1.11.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:124) [1.11.jar:?]
Caused by: java.lang.NullPointerException
at bnm.a(SourceFile:468) ~[1.11.jar:?]
at fv.a(SourceFile:67) ~[1.11.jar:?]
at fv.a(SourceFile:14) ~[1.11.jar:?]
at fo$1.run(SourceFile:13) ~[1.11.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
at h.a(SourceFile:46) ~[1.11.jar:?]
… 3 more
#
# A fatal error has been detected by the Java Runtime Environment:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x000000001b1ba9b5, pid=2732, tid=3592
#
# JRE version: Java(TM) SE Runtime Environment (8.0_25-b18) (build 1.8.0_25-b18)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.25-b02 mixed mode windows-amd64 compressed oops)
# Problematic frame:
# C [ig75icd64.dll+0x6a9b5]
#
# Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
#
# An error report file with more information is saved as:
# C:\Users\Justin\AppData\Roaming\.minecraft\hs_err_pid2732.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.sun.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
AL lib: (EE) alc_cleanup: 1 device not closed
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release