title: Android Studio Suddenly Crashed and now showing error
body: <p>I am creating an app since two months and today it suddenly crashed and when i try to open Android Studio its showing this...</p>
  <pre><code> Internal error. Please refer to https://code.google.com/p/android/issues
  
  java.lang.NoClassDefFoundError: io/netty/channel/ChannelHandler
  at com.intellij.idea.StartupUtil.lockSystemDirs(StartupUtil.java:464)
  at com.intellij.idea.StartupUtil.prepareApp(StartupUtil.java:184)
  at com.intellij.ide.plugins.MainRunner.lambda$start$0(MainRunner.java:45)
  at java.lang.Thread.run(Thread.java:748)
  Caused by: java.lang.ClassNotFoundException: io.netty.channel.ChannelHandler
  at com.intellij.util.lang.UrlClassLoader.findClass(UrlClassLoader.java:307)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
  ... 4 more
  </code></pre>
  <hr />
  <pre><code>JRE 1.8.0_162-b12 amd64 by Oracle Corporation
  C:\Program Files\Java\jdk1.8.0_162\
  </code></pre>