Help~~ CRJAZ1579E error in third step of setup

In the third step of setup jts server,I get a error
Cound someone told me what happened ,and how to resolve the problem?
Thank you.

jts/setup#/steps/3
error code is CRJAZ1579E
error message is following:
descriptor must not be null
java.lang.IllegalArgumentException
com.ibm.team.repository.common.transport.internal.registry.ConfigurationManager.getConfiguration(ConfigurationManager.java:54)
com.ibm.team.repository.common.transport.internal.registry.ConfigurationManager.getConfiguration(ConfigurationManager.java:116)
com.ibm.team.repository.common.transport.internal.registry.OsgiServicesManager.getServiceConfigurationForImplementation(OsgiServicesManager.java:295)
com.ibm.team.repository.service.internal.ServerConfigurationRestService.getConfiguration(ServerConfigurationRestService.java:104)
com.ibm.team.repository.service.internal.ServerConfigurationRestService.processConfigUpdates(ServerConfigurationRestService.java:224)
com.ibm.team.repository.service.internal.ServerConfigurationRestService.postConfigurationValidation(ServerConfigurationRestService.java:329)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:618)
org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.invoke(ExportProxyServiceRecord.java:370)
org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.access$0(ExportProxyServiceRecord.java:356)
org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord$ExportedServiceInvocationHandler.invoke(ExportProxyServiceRecord.java:56)
$Proxy74.postConfigurationValidation(Unknown Source)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:618)
com.ibm.team.repository.servlet.AbstractTeamServerServlet.doModelledRestService(AbstractTeamServerServlet.java:504)
com.ibm.team.repository.servlet.AbstractTeamServerServlet.handleRequest2(AbstractTeamServerServlet.java:1867)
com.ibm.team.repository.servlet.AbstractTeamServerServlet.handleRequest(AbstractTeamServerServlet.java:1723)
com.ibm.team.repository.servlet.AbstractTeamServerServlet.service(AbstractTeamServerServlet.java:1632)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.eclipse.equinox.http.registry.internal.ServletManager$ServletWrapper.service(ServletManager.java:180)
org.eclipse.equinox.http.servlet.internal.ServletRegistration.handleRequest(ServletRegistration.java:90)
org.eclipse.equinox.http.servlet.internal.ProxyServlet.processAlias(ProxyServlet.java:111)
org.eclipse.equinox.http.servlet.internal.ProxyServlet.service(ProxyServlet.java:75)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.eclipse.equinox.servletbridge.BridgeServlet.service(BridgeServlet.java:120)
com.ibm.team.repository.server.servletbridge.JazzServlet.service(JazzServlet.java:76)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:563)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:420)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:879)
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
java.lang.Thread.run(Thread.java:811)