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

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

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    Root Cause Analysis

    1. java.lang.NullPointerException

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

      at org.openqa.selenium.server.FrameGroupCommandQueueSet.getQueueSet()
    2. selenium-server
      SeleniumDriverResourceHandler.handle
      1. org.openqa.selenium.server.FrameGroupCommandQueueSet.getQueueSet(FrameGroupCommandQueueSet.java:220)
      2. org.openqa.selenium.server.SeleniumDriverResourceHandler.handleBrowserResponse(SeleniumDriverResourceHandler.java:186)
      3. org.openqa.selenium.server.SeleniumDriverResourceHandler.handle(SeleniumDriverResourceHandler.java:152)
      3 frames
    3. selenium-jetty-rc-repacked
      ThreadPool$PoolThread.run
      1. org.openqa.jetty.http.HttpContext.handle(HttpContext.java:1526)
      2. org.openqa.jetty.http.HttpContext.handle(HttpContext.java:1479)
      3. org.openqa.jetty.http.HttpServer.service(HttpServer.java:920)
      4. org.openqa.jetty.http.HttpConnection.service(HttpConnection.java:820)
      5. org.openqa.jetty.http.HttpConnection.handleNext(HttpConnection.java:986)
      6. org.openqa.jetty.http.HttpConnection.handle(HttpConnection.java:837)
      7. org.openqa.jetty.http.SocketListener.handleConnection(SocketListener.java:243)
      8. org.openqa.jetty.util.ThreadedServer.handle(ThreadedServer.java:358)
      9. org.openqa.jetty.util.ThreadPool$PoolThread.run(ThreadPool.java:537)
      9 frames