我有一台Windows 7 VM。我正在尝试执行我的selenium RC脚本。我正面临一个问题。当我启动简单的基本脚本（Say＆＃39;登录＆＃39;）时，它会启动chrome浏览器。它继续说'加载......＆＃39;。
几分钟后，我在eclipse控制台中收到以下错误。
12:54:31.183 INFO - Launching Google Chrome...
12:54:36.791 INFO - Started SocketListener on 0.0.0.0:49408
12:54:37.111 INFO - Started SocketListener on 0.0.0.0:49412
12:54:37.379 INFO - Started SocketListener on 0.0.0.0:49415
12:54:40.887 INFO - Couldn't proxy to http://hipaamg/ because host not found
12:55:01.770 INFO - Started SocketListener on 0.0.0.0:49449
12:55:31.762 INFO - Started SocketListener on 0.0.0.0:49462
13:24:33.733 ERROR - Failed to start new browser session, shutdown browser and clear all session data
org.openqa.selenium.server.RemoteCommandException: timed out waiting for window 'null' to appear
at org.openqa.selenium.server.FrameGroupCommandQueueSet.waitForLoad(FrameGroupCommandQueueSet.java:578)
at org.openqa.selenium.server.FrameGroupCommandQueueSet.waitForLoad(FrameGroupCommandQueueSet.java:537)
at org.openqa.selenium.server.BrowserSessionFactory.createNewRemoteSession(BrowserSessionFactory.java:375)
at org.openqa.selenium.server.BrowserSessionFactory.getNewBrowserSession(BrowserSessionFactory.java:125)
at org.openqa.selenium.server.BrowserSessionFactory.getNewBrowserSession(BrowserSessionFactory.java:86)
at org.openqa.selenium.server.SeleniumDriverResourceHandler.getNewBrowserSession(SeleniumDriverResourceHandler.java:811)
at org.openqa.selenium.server.SeleniumDriverResourceHandler.doCommand(SeleniumDriverResourceHandler.java:437)
at org.openqa.selenium.server.SeleniumDriverResourceHandler.handleCommandRequest(SeleniumDriverResourceHandler.java:407)
at org.openqa.selenium.server.SeleniumDriverResourceHandler.handle(SeleniumDriverResourceHandler.java:151)
at org.openqa.jetty.http.HttpContext.handle(HttpContext.java:1530)
at org.openqa.jetty.http.HttpContext.handle(HttpContext.java:1482)
at org.openqa.jetty.http.HttpServer.service(HttpServer.java:909)
at org.openqa.jetty.http.HttpConnection.service(HttpConnection.java:820)
at org.openqa.jetty.http.HttpConnection.handleNext(HttpConnection.java:986)
at org.openqa.jetty.http.HttpConnection.handle(HttpConnection.java:837)
at org.openqa.jetty.http.SocketListener.handleConnection(SocketListener.java:243)
at org.openqa.jetty.util.ThreadedServer.handle(ThreadedServer.java:357)
at org.openqa.jetty.util.ThreadPool$PoolThread.run(ThreadPool.java:534)
13:24:33.735 INFO - Killing Google Chrome...
13:24:33.846 INFO - Got result: Failed to start new browser session: Error while launching browser on session null
请你帮我解释为什么我会收到这个错误。我尝试了一些禁用安全性的方法。但我无法解决这个问题。任何有关这方面的帮助将不胜感激。