Android Studio not starting , failed to create a child event loop , cannot lock system folders
<p>Android Studio not starting, failed to create a child event loop, cannot lock system folders</p>

<blockquote>
  <p>java.lang.IllegalStateException: failed to create a child event loop
          at io.netty.util.concurrent.MultithreadEventExecutorGroup.(MultithreadEventExecutorGroup.java:81)
          at io.netty.util.concurrent.MultithreadEventExecutorGroup.(MultithreadEventExecutorGroup.java:48)
          at io.netty.channel.MultithreadEventLoopGroup.(MultithreadEventLoopGroup.java:57)
          at io.netty.channel.nio.NioEventLoopGroup.(NioEventLoopGroup.java:67)
          at io.netty.channel.nio.NioEventLoopGroup.(NioEventLoopGroup.java:54)
          at org.jetbrains.io.BuiltInServer.start(BuiltInServer.java:79)
          at com.intellij.idea.SocketLock$2.call(SocketLock.java:133)
          at com.intellij.idea.SocketLock$2.call(SocketLock.java:113)
          at com.intellij.idea.SocketLock.underLocks(SocketLock.java:157)
          at com.intellij.idea.SocketLock.lock(SocketLock.java:113)
          at com.intellij.idea.StartupUtil.lockSystemFolders(StartupUtil.java:263)
          at com.intellij.idea.StartupUtil.prepareAndStart(StartupUtil.java:101)
          at com.intellij.idea.MainImpl.start(MainImpl.java:34)
          at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
          at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
          at java.lang.reflect.Method.invoke(Method.java:498)
          at com.intellij.ide.plugins.PluginManager$2.run(PluginManager.java:91)
          at java.lang.Thread.run(Thread.java:745)
      Caused by: io.netty.channel.ChannelException: failed to open a new selector
          at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:127)
          at io.netty.channel.nio.NioEventLoop.(NioEventLoop.java:119)
          at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:97)
          at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:31)
          at io.netty.util.concurrent.MultithreadEventExecutorGroup.(MultithreadEventExecutorGroup.java:77)
          ... 18 more
      Caused by: java.io.IOException: Unable to establish loopback connection
          at sun.nio.ch.PipeImpl$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.(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.(WindowsSelectorImpl.java:127)
          at sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:44)
          at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:125)
          ... 22 more
      Caused by: java.net.ConnectException: Connection timed out: connect
          at sun.nio.ch.Net.connect0(Native Method)
          at sun.nio.ch.Net.connect(Net.java:454)
          at sun.nio.ch.Net.connect(Net.java:446)
          at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)</p>
</blockquote>