Searched on Google with the first line of a JAVA stack trace?

We can recommend more relevant solutions and speed up debugging when you paste your entire stack trace with the exception message. Try a sample exception.

Recommended solutions based on your search

Solutions on the web

via Mojang JIRA by niklkall, 1 year ago
failed to create a child event loop
via Mojang JIRA by niklkall, 2 years ago
failed to create a child event loop
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 lm$1.a(SourceFile:44) at lm$1.b(SourceFile:41) at np.c(SourceFile:10) at lm.a(SourceFile:121) at avf.a(SourceFile:1941) at axw.i(SourceFile:172) at axw.a(SourceFile:135) at axv.a(SourceFile:350) at axv.k(SourceFile:413) at axw.k(SourceFile:81) at axv.p(SourceFile:390) at avf.s(SourceFile:1497) at avf.av(SourceFile:888) at avf.a(SourceFile:325) at net.minecraft.client.main.Main.main(SourceFile:124)Caused by: io.netty.channel.ChannelException: failed to open a new selector at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:128) at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:120) at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:87) at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:64) ... 18 moreCaused by: java.io.IOException: Unable to establish loopback connection at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101) at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68) at java.security.AccessController.doPrivileged(Native Method) at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170) at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50) at java.nio.channels.Pipe.open(Pipe.java:155) at sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:127) at sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:44) at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:126) ... 21 moreCaused by: java.net.SocketException: Permission denied: connect at sun.nio.ch.Net.connect0(Native Method) at sun.nio.ch.Net.connect(Net.java:457) at sun.nio.ch.Net.connect(Net.java:449) at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:647) at java.nio.channels.SocketChannel.open(SocketChannel.java:189) at sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(PipeImpl.java:130) at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:83) ... 29 more