java.lang.NullPointerException: sessionId should not be null; has this session b een started yet?

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    Root Cause Analysis

    1. java.lang.NullPointerException

      sessionId should not be null; has this session b een started yet?

      at org.openqa.selenium.server.FrameGroupCommandQueueSet.getQueueSet()
    2. selenium-server
      SeleniumDriverResourceHandler.handle
      1. org.openqa.selenium.server.FrameGroupCommandQueueSet.getQueueSet(FrameGroupCommandQueueSet.java:214)
      2. org.openqa.selenium.server.commands.SeleniumCoreCommand.execute(SeleniumCoreCommand.java:34)
      3. org.openqa.selenium.server.SeleniumDriverResourceHandler.doCommand(SeleniumDriverResourceHandler.java:549)
      4. org.openqa.selenium.server.SeleniumDriverResourceHandler.handleCommandRequest(SeleniumDriverResourceHandler.java:364)
      5. org.openqa.selenium.server.SeleniumDriverResourceHandler.handle(SeleniumDriverResourceHandler.java:125)
      5 frames
    3. org.mortbay.http
      SocketListener.handleConnection
      1. org.mortbay.http.HttpContext.handle(HttpContext.java:1530)
      2. org.mortbay.http.HttpContext.handle(HttpContext.java:1482)
      3. org.mortbay.http.HttpServer.service(HttpServer.java:909)
      4. org.mortbay.http.HttpConnection.service(HttpConnection.java:820)
      5. org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:986)
      6. org.mortbay.http.HttpConnection.handle(HttpConnection.java:837)
      7. org.mortbay.http.SocketListener.handleConnection(SocketListener.java:245)
      7 frames
    4. Jetty Util
      ThreadPool$PoolThread.run
      1. org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
      2. org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)
      2 frames