Eclipse RAP 照着官网指导创建helloworld程序报错：The ?报错

下好了Eclipse RCP 、添加好了Target-platform（http://my.oschina.net/u/2268927/blog/412997），然后能够导入DEMO，但是运行的时候各种报错，如果按照官网的导入就会报很多东西找不到的错误

使用add required bundle 按钮自动导入的话，就报如下错误

java.lang.RuntimeException: org.osgi.service.http.NamespaceException: The alias '/rwt-resources' is already in use. at org.eclipse.rap.rwt.osgi.internal.ApplicationReferenceImpl.registerResourceDirectory(ApplicationReferenceImpl.java:197) at org.eclipse.rap.rwt.osgi.internal.ApplicationReferenceImpl.startRWTApplication(ApplicationReferenceImpl.java:79) at org.eclipse.rap.rwt.osgi.internal.ApplicationReferenceImpl.start(ApplicationReferenceImpl.java:63) at org.eclipse.rap.rwt.osgi.internal.ApplicationLauncherImpl.doLaunch(ApplicationLauncherImpl.java:105) at org.eclipse.rap.rwt.osgi.internal.ApplicationLauncherImpl.launch(ApplicationLauncherImpl.java:87) at org.eclipse.rap.rwt.osgi.internal.ApplicationLauncherImpl.launch(ApplicationLauncherImpl.java:164) at org.eclipse.rap.rwt.osgi.internal.ApplicationLauncherImpl.launchWithConfiguration(ApplicationLauncherImpl.java:151) at org.eclipse.rap.rwt.osgi.internal.ApplicationLauncherImpl.addConfiguration(ApplicationLauncherImpl.java:66) at org.eclipse.rap.rwt.osgi.internal.ApplicationConfigurationTracker.addingService(ApplicationConfigurationTracker.java:35) at org.eclipse.rap.rwt.osgi.internal.ApplicationConfigurationTracker.addingService(ApplicationConfigurationTracker.java:1) at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.java:941) at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.java:1) at org.osgi.util.tracker.AbstractTracked.trackAdding(AbstractTracked.java:256) at org.osgi.util.tracker.AbstractTracked.track(AbstractTracked.java:229) at org.osgi.util.tracker.ServiceTracker$Tracked.serviceChanged(ServiceTracker.java:901) at org.eclipse.osgi.internal.serviceregistry.FilteredServiceListener.serviceChanged(FilteredServiceListener.java:109) at org.eclipse.osgi.internal.framework.BundleContextImpl.dispatchEvent(BundleContextImpl.java:914) at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230) at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148) at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEventPrivileged(ServiceRegistry.java:862) at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEvent(ServiceRegistry.java:801) at org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.register(ServiceRegistrationImpl.java:127) at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.registerService(ServiceRegistry.java:225) at org.eclipse.osgi.internal.framework.BundleContextImpl.registerService(BundleContextImpl.java:464) at org.eclipse.equinox.internal.ds.InstanceProcess.registerService(InstanceProcess.java:536) at org.eclipse.equinox.internal.ds.InstanceProcess.buildComponents(InstanceProcess.java:260) at org.eclipse.equinox.internal.ds.Resolver.buildNewlySatisfied(Resolver.java:473) at org.eclipse.equinox.internal.ds.Resolver.enableComponents(Resolver.java:217) at org.eclipse.equinox.internal.ds.SCRManager.performWork(SCRManager.java:816) at org.eclipse.equinox.internal.ds.SCRManager$QueuedJob.dispatch(SCRManager.java:783) at org.eclipse.equinox.internal.ds.WorkThread.run(WorkThread.java:89) at org.eclipse.equinox.internal.util.impl.tpt.threadpool.Executor.run(Executor.java:70) Caused by: org.osgi.service.http.NamespaceException: The alias '/rwt-resources' is already in use. at org.eclipse.equinox.http.servlet.internal.ProxyServlet.registerServlet(ProxyServlet.java:169) at org.eclipse.equinox.http.servlet.internal.ProxyServlet.registerResources(ProxyServlet.java:199) at org.eclipse.equinox.http.servlet.internal.HttpServiceImpl.registerResources(HttpServiceImpl.java:78) at org.eclipse.rap.rwt.osgi.internal.ApplicationReferenceImpl.registerResourceDirectory(ApplicationReferenceImpl.java:193) ... 31 more

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	有人用RAP么，能弄个HELLOWORD的教程给俺么？<img src="http://www.oschina.net/js/ke/plugins/emoticons/images/54.gif" alt="">
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