How to solve it?

com.ibm.websphere.management.exception.AdminExcept ion: Unexpected Exception from gatherJNDINames: java.lang.NullPointerException
    at com.ibm.websphere.management.application.client.Re sValidationHelper.gatherJNDINames(ResValidationHel per.java:249)
    at com.ibm.ws.console.appmanagement.ResourceValidatio nHelper.gatherJNDIData(ResourceValidationHelper.ja va:92)
    at com.ibm.ws.console.appmanagement.action.MapModules ToServersAction.execute(MapModulesToServersAction. java:176)
    at org.apache.struts.action.RequestProcessor.processA ctionPerform(RequestProcessor.java:484)
    at org.apache.struts.action.RequestProcessor.process( RequestProcessor.java:275)
    at org.apache.struts.action.ActionServlet.process(Act ionServlet.java:1486)
    at org.apache.struts.action.ActionServlet.doPost(Acti onServlet.java:528)
    at javax.servlet.http.HttpServlet.service(HttpServlet .java:763)
    at javax.servlet.http.HttpServlet.service(HttpServlet .java(Compiled Code))
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.ser vice(ServletWrapper.java(Compiled Code))
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.han dleRequest(ServletWrapper.java(Compiled Code))
    at com.ibm.ws.webcontainer.servlet.CacheServletWrappe r.handleRequest(CacheServletWrapper.java:80)
    at com.ibm.ws.webcontainer.WebContainer.handleRequest (WebContainer.java:1657)
    at com.ibm.ws.webcontainer.channel.WCChannelLink.read y(WCChannelLink.java:77)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLi nk.handleDiscrimination(HttpInboundLink.java:421)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLi nk.handleNewInformation(HttpInboundLink.java:367)
    at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCa llback.complete(HttpICLReadCallback.java:94)
    at com.ibm.ws.tcp.channel.impl.WorkQueueManager.reque stComplete(WorkQueueManager.java(Compiled Code))
    at com.ibm.ws.tcp.channel.impl.WorkQueueManager.attem ptIO(WorkQueueManager.java(Compiled Code))
    at com.ibm.ws.tcp.channel.impl.WorkQueueManager.worke rRun(WorkQueueManager.java(Compiled Code))
    at com.ibm.ws.tcp.channel.impl.WorkQueueManager$Worke r.run(WorkQueueManager.java(Compiled Code))
    at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.j ava(Compiled Code))
Caused by: java.lang.NullPointerException
    at com.ibm.ws.workspace.query.impl.WorkSpaceQueryUtil Impl.getResourceNameFromJNDI(WorkSpaceQueryUtilImp l.java:491)
    at com.ibm.websphere.management.application.client.Re sValidationHelper._getJNDINames(ResValidationHelpe r.java:1184)
    at com.ibm.websphere.management.application.client.Re sValidationHelper.gatherJNDINames(ResValidationHel per.java:200)
    ... 21 more