我正在Coldfusion服务器上设置BlazeDS，我正试图让一个简单的聊天界面显示出来。设置包括在coldfusion管理员中创建一个网关，然后使用一个简单的Flex聊天室点击它。我已经在自己的计算机上进行了本地测试，但它确实有效。所以我在服务器上做了同样的事情。我测试了网关，它似乎工作。但是，当我尝试在外部使用Flex代码时，我收到以下错误..
12/28 15:01:11 Information [scheduler-0] - Run Client Storage Purge
[BlazeDS]null
java.lang.NullPointerException
at flex.messaging.endpoints.amf.SerializationFilter.deserializationError
(SerializationFilter.java:236)
at flex.messaging.endpoints.amf.SerializationFilter.invoke(Serialization
Filter.java:130)
at flex.messaging.endpoints.BaseHTTPEndpoint.service(BaseHTTPEndpoint.ja
va:278)
at coldfusion.flash.messaging.CFAMFEndPoint.service(CFAMFEndPoint.java:2
95)
at flex.messaging.MessageBrokerServlet.service(MessageBrokerServlet.java
:322)
at coldfusion.flex.ColdFusionMessageBrokerServlet.service(ColdFusionMess
ageBrokerServlet.java:114)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at coldfusion.bootstrap.BootstrapServlet.service(BootstrapServlet.java:8
9)
at jrun.servlet.FilterChain.doFilter(FilterChain.java:86)
at coldfusion.filter.FlashRequestControlFilter.doFilter(FlashRequestCont
rolFilter.java:71)
at coldfusion.bootstrap.BootstrapFilter.doFilter(BootstrapFilter.java:46
)
at jrun.servlet.FilterChain.doFilter(FilterChain.java:94)
at jrun.servlet.FilterChain.service(FilterChain.java:101)
at jrun.servlet.ServletInvoker.invoke(ServletInvoker.java:106)
at jrun.servlet.JRunInvokerChain.invokeNext(JRunInvokerChain.java:42)
at jrun.servlet.JRunRequestDispatcher.invoke(JRunRequestDispatcher.java:
286)
at jrun.servlet.ServletEngineService.dispatch(ServletEngineService.java:
543)
at jrun.servlet.jrpp.JRunProxyService.invokeRunnable(JRunProxyService.ja
va:203)
at jrunx.scheduler.ThreadPool$ThreadThrottle.invokeRunnable(ThreadPool.j
ava:428)
at jrunx.scheduler.WorkerThread.run(WorkerThread.java:66)
这个错误意味着什么，可能的解决方案是什么？