Minecraft Forums

I'm at the end of my tether. I spent 5 hours yesterday trying to fix bugs upon bugs! My problem right now is that when I try to create a new world it says "Building Terrain" and then crashes.

Here is a brief snapshot of my journey:
> Had a 5 year old launcher/game
> Got the bug where launcher freezes every 3 minutes
> Uninstalled it
> Reinstalled new minecraft launcher
> Installed it
> Try creating a world, get to "Building terrain" and then crash.

Here is what I have tried according to forums and Youtube videos:
> Changed my resolution in my profile settings
> Put all graphics on low
> Put render on 2 chunks, FPS on unlimited
> Uninstalled/Reinstalled
> Restarted my PC

--> Another "fix" is to go into a multiplayer game, exit out, and then start a single player
UNFORTUNATELY, this creates another bug in that I can't connect to any servers not in my local network.
I tried to fix this this with port forwarding on my router as well as changing my internet settings on my computer (TCP/UDP).
No dice on that one either.

So I cannot fix the bug of crashing by going onto a multiplayer server, because I also have a bug where I can't play multiplayer.

At this point I'm wondering if Minecraft never existed and this is some elaborate ruse to make me throw my PC out the window.

All I want to do is play single player in creative mode. TT_TT

Here is my latest crash log:

---- Minecraft Crash Report ----
// Quite honestly, I wouldn't worry myself about that.

Time: 5/22/15 1:31 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 ll$1.a(SourceFile:44)
at ll$1.b(SourceFile:41)
at no.c(SourceFile:10)
at ll.a(SourceFile:121)
at ave.a(SourceFile:1941)
at axv.i(SourceFile:172)
at axv.a(SourceFile:135)
at axu.a(SourceFile:350)
at axu.k(SourceFile:413)
at axv.k(SourceFile:81)
at axu.p(SourceFile:390)
at ave.s(SourceFile:1497)
at ave.av(SourceFile:888)
at ave.a(SourceFile:325)
at net.minecraft.client.main.Main.main(SourceFile:124)
Caused by: io.netty.channel.ChannelException: failed to open a new selector
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:128)
at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:120)
at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:87)
at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:64)
... 18 more
Caused by: java.io.IOException: Unable to establish loopback connection
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)
at java.security.AccessController.doPrivileged(Native Method)
at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)
at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)
at java.nio.channels.Pipe.open(Pipe.java:155)
at sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:127)
at sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:44)
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:126)
... 21 more
Caused by: java.net.ConnectException: Connection refused: connect
at sun.nio.ch.Net.connect0(Native Method)
at sun.nio.ch.Net.connect(Net.java:457)
at sun.nio.ch.Net.connect(Net.java:449)
at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:647)
at java.nio.channels.SocketChannel.open(SocketChannel.java:189)
at sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(PipeImpl.java:130)
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:83)
... 29 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 ll$1.a(SourceFile:44)
at ll$1.b(SourceFile:41)
at no.c(SourceFile:10)
at ll.a(SourceFile:121)
at ave.a(SourceFile:1941)
at axv.i(SourceFile:172)
at axv.a(SourceFile:135)
at axu.a(SourceFile:350)
at axu.k(SourceFile:413)
at axv.k(SourceFile:81)
at axu.p(SourceFile:390)

-- Affected screen --
Details:
Screen name: aya
Stacktrace:
at ave.s(SourceFile:1497)
at ave.av(SourceFile:888)
at ave.a(SourceFile:325)
at net.minecraft.client.main.Main.main(SourceFile:124)

-- System Details --
Details:
Minecraft Version: 1.8.4
Operating System: Windows 7 (amd64) version 6.1
CPU: 4x AMD Phenom(tm) II X4 840 Processor
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 99868464 bytes (95 MB) / 329023488 bytes (313 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Launched Version: 1.8.4
LWJGL: 2.9.4
OpenGL: GeForce GTS 450/PCI/SSE2 GL version 4.2.0, NVIDIA Corporation
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)

failed to create a child event loop

This means, for some reason, Minecraft is unable to create a localhost connection with your client and your server. This can be caused by many things, here's a few to try:

Turn off your firewall (Preferably while you're not connected to the internet)

Turn off your antivirus "

Turn off any programs that have to do with networking, such as a web-filter.

Quote from AwesomeSeal»

failed to create a child event loop

This means, for some reason, Minecraft is unable to create a localhost connection with your client and your server. This can be caused by many things, here's a few to try:

Turn off your firewall (Preferably while you're not connected to the internet)

Turn off your antivirus "

Turn off any programs that have to do with networking, such as a web-filter.

The only program I think I have is Hola for Chrome (which I don't even think counts, but I turned it off for good measure) and turned off firewall and antivirus.

Still getting java.lang.IllegalStateException: failed to create a child event loop

Also my launcher just "downloaded" the 1.8.5 launcher when I opened it this time... so IDK if that means anything.

java.lang.IllegalStateException: failed to create a child event loop

This means that some program on your computer is blocking Minecraft from accessing the files it needs to. Most likely an AntiVirus or some malware.

This issue is normally caused by a faulty installation of avast. Completely uninstall avast, then reinstall avast.

I don't have avast on my PC. I had Norton and McAfee and MalwareBytes. I uninstalled all of them, turned off hola and firewall... still getting the same error.

Like... I just want to play offline single player mode -.-

Uninstall and reinstall.

Quote from DankMineral»

I don't have avast on my PC. I had Norton and McAfee and MalwareBytes. I uninstalled all of them, turned off hola and firewall... still getting the same error.

Like... I just want to play offline single player mode -.-

Uninstall mcafee and norton.

Tried that 3 times

Quote from Jiggy12321»

Uninstall and reinstall.

Tried that 3 times.

Quote from Afootpluto»

Uninstall mcafee and norton.

Like I said in the quote you quoted, I've uninstalled all of them.

Turn off anything that might restrict files from being accessed.

Im getting same problem minecraft worked fine until i started using mods and the first time it appeared was when i used orespawn. i removed it from my mods folder and that seemed to fix the problem until a few weeks ago:( then it started crashing my minecraft no matter what mods i removed. i thought that maybe the forge profile was bugged so i switched back to (default) profile tried all my profiles still didnt work. i already tried disabling firewall did not work can someone help? crash report here if it will help you fix: try to join server says:java.lang.NullPointerException: group ---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 8/10/15 9:51 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 ll$1.a(SourceFile:44)
at ll$1.b(SourceFile:41)
at no.c(SourceFile:10)
at ll.a(SourceFile:121)
at ave.a(SourceFile:1941)
at axv.i(SourceFile:172)
at axv.a(SourceFile:135)
at axu.a(SourceFile:350)
at axu.k(SourceFile:413)
at axv.k(SourceFile:81)
at axu.p(SourceFile:390)
at ave.s(SourceFile:1497)
at ave.av(SourceFile:888)
at ave.a(SourceFile:325)
at net.minecraft.client.main.Main.main(SourceFile:124)
Caused by: io.netty.channel.ChannelException: failed to open a new selector
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:128)
at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:120)
at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:87)
at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:64)
... 18 more
Caused by: java.io.IOException: Unable to establish loopback connection
at sun.nio.ch.PipeImpl$Initializer.run(Unknown Source)
at sun.nio.ch.PipeImpl$Initializer.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.nio.ch.PipeImpl.<init>(Unknown Source)
at sun.nio.ch.SelectorProviderImpl.openPipe(Unknown Source)
at java.nio.channels.Pipe.open(Unknown Source)
at sun.nio.ch.WindowsSelectorImpl.<init>(Unknown Source)
at sun.nio.ch.WindowsSelectorProvider.openSelector(Unknown Source)
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:126)
... 21 more
Caused by: java.net.SocketException: Unrecognized Windows Sockets error: 10106: socket
at sun.nio.ch.Net.socket0(Native Method)
at sun.nio.ch.Net.serverSocket(Unknown Source)
at sun.nio.ch.ServerSocketChannelImpl.<init>(Unknown Source)
at sun.nio.ch.SelectorProviderImpl.openServerSocketChannel(Unknown Source)
at java.nio.channels.ServerSocketChannel.open(Unknown Source)
at sun.nio.ch.PipeImpl$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 ll$1.a(SourceFile:44)
at ll$1.b(SourceFile:41)
at no.c(SourceFile:10)
at ll.a(SourceFile:121)
at ave.a(SourceFile:1941)
at axv.i(SourceFile:172)
at axv.a(SourceFile:135)
at axu.a(SourceFile:350)
at axu.k(SourceFile:413)
at axv.k(SourceFile:81)
at axu.p(SourceFile:390)

-- Affected screen --
Details:
Screen name: aya
Stacktrace:
at ave.s(SourceFile:1497)
at ave.av(SourceFile:888)
at ave.a(SourceFile:325)
at net.minecraft.client.main.Main.main(SourceFile:124)

-- System Details --
Details:
Minecraft Version: 1.8.7
Operating System: Windows 7 (amd64) version 6.1
CPU: 2x Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz
Java Version: 1.8.0_40, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 92696168 bytes (88 MB) / 258887680 bytes (246 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
Launched Version: 1.8.7
LWJGL: 2.9.4
OpenGL: ATI Radeon HD 4350 GL version 2.1.8781, ATI Technologies Inc.
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because ARB_framebuffer_object 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)