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

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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:497)

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