NullPointerException while using Tiles

[ra...@tcs.com]

Hi,
        I am using Tiles in my application. Whenever i am redeploying or 
making any changes i am getting the following error. If i restart the 
server, it is working fine. Any idea about this?
        Thanks in advance.

Error 500--Internal Server Error

java.lang.NullPointerException
                 at 
org.apache.struts.tiles.definition.ComponentDefinitionsFactoryWrapper.getDefinition(ComponentDefinitionsFactoryWrapper.java:124)
                 at 
org.apache.struts.tiles.TilesRequestProcessor.processTilesDefinition(TilesRequestProcessor.java:180)
                 at 
org.apache.struts.tiles.TilesRequestProcessor.internalModuleRelativeForward(TilesRequestProcessor.java:341)
                 at 
org.apache.struts.action.RequestProcessor.processForward(RequestProcessor.java:582)
                 at 
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:260)
                 at 
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
                 at 
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
                 at 
javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
                 at 
javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
                 at 
weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1053)
                 at 
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:387)
                 at 
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:305)
                 at 
weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6310)
                 at 
weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:317)
                 at 
weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118)
                 at 
weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3622)
                 at 
weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2569)
                 at 
weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
                 at 
weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)



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