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Minecraft Crash Report is this:

---- Minecraft Crash Report ----
// I let you down. Sorry

Time: 29/12/14 08:19 PM
Description: Updating screen events

java.lang.IllegalStateException: failed to create a child event loop
at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:68)
at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:49)
at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:61)
at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:52)
at re.a(SourceFile:44)
at re.b(SourceFile:41)
at ur.c(SourceFile:10)
at rd.a(SourceFile:121)
at bss.a(SourceFile:1923)
at bxf.i(SourceFile:172)
at bxf.a(SourceFile:135)
at bxe.a(SourceFile:342)
at bxe.k(SourceFile:405)
at bxf.k(SourceFile:81)
at bxe.p(SourceFile:382)
at bss.r(SourceFile:1480)
at bss.at(SourceFile:880)
at bss.a(SourceFile:317)
at net.minecraft.client.main.Main.main(SourceFile:124)
Caused by: io.netty.channel.ChannelException: failed to open a new selector
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:128)
at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:120)
at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:87)
at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:64)
... 18 more
Caused by: java.io.IOException: Unable to establish loopback connection
at sun.nio.ch.PipeImpl$Initializer.run(Unknown Source)
at sun.nio.ch.PipeImpl$Initializer.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.nio.ch.PipeImpl.<init>(Unknown Source)
at sun.nio.ch.SelectorProviderImpl.openPipe(Unknown Source)
at java.nio.channels.Pipe.open(Unknown Source)
at sun.nio.ch.WindowsSelectorImpl.<init>(Unknown Source)
at sun.nio.ch.WindowsSelectorProvider.openSelector(Unknown Source)
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:126)
... 21 more
Caused by: java.net.ConnectException: Connection timed out: connect
at sun.nio.ch.Net.connect0(Native Method)
at sun.nio.ch.Net.connect(Unknown Source)
at sun.nio.ch.Net.connect(Unknown Source)
at sun.nio.ch.SocketChannelImpl.connect(Unknown Source)
at java.nio.channels.SocketChannel.open(Unknown Source)
at sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(Unknown Source)
... 30 more


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:68)
at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:49)
at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:61)
at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:52)
at re.a(SourceFile:44)
at re.b(SourceFile:41)
at ur.c(SourceFile:10)
at rd.a(SourceFile:121)
at bss.a(SourceFile:1923)
at bxf.i(SourceFile:172)
at bxf.a(SourceFile:135)
at bxe.a(SourceFile:342)
at bxe.k(SourceFile:405)
at bxf.k(SourceFile:81)
at bxe.p(SourceFile:382)

-- Affected screen --
Details:
Screen name: bxp
Stacktrace:
at bss.r(SourceFile:1480)
at bss.at(SourceFile:880)
at bss.a(SourceFile:317)
at net.minecraft.client.main.Main.main(SourceFile:124)

-- System Details --
Details:
Minecraft Version: 1.8.1
Operating System: Windows 8.1 (x86) version 6.3
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 180597728 bytes (172 MB) / 314101760 bytes (299 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
Launched Version: 1.8.1
LWJGL: 2.9.1
OpenGL: AMD Radeon HD 7520G GL version 4.2.12420 Compatibility Profile Context 13.151.0.0, ATI Technologies Inc.
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: No
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)

Help! Please

Mod list. Cant help much without it. Nobody can.

Quote from darkraven418»

Mod list. Cant help much without it. Nobody can.

So, what I have to do?

Post which mods or modpack you are using.

Tyteen4a03 - "If you are getting this error, that means an application is trying to stop Minecraft from running. Usually, it is junk software and/or malware. Hop onto #minecrafthelp and tell the helpers you are getting this error."



"failed to create a child event loop" is your error. Go to Esper, type a name and use #minecrafthelp for the channel.

Quote from darkraven418»

Tyteen4a03 - "If you are getting this error, that means an application is trying to stop Minecraft from running. Usually, it is junk software and/or malware. Hop onto #minecrafthelp and tell the helpers you are getting this error."



"failed to create a child event loop" is your error. Go to Esper, type a name and use #minecrafthelp for the channel.

It worked! Thanks a lot! <3 :3