Runtime Error in Web Page Composer (WPC) : Page Editor

Hello,
We are using the Web page Composer to design our portal homepage. The portal version is 7.02 SP6.
We created a site, some site content like banners and articles, and a blank web page. When we try to add the site content to the web page from the "Page Editor" by clicking on the pencil icon -> "Add", a runtime error occurs on the Web Content Browser pop up page. The drag and drop feature to add content is not working either.
The error message is as follows:
Runtime Error
An exception occured while processing the request.
Additional information: null
Exception ID = 0076b5e1-fea6-2e10-b49e-9e1f27bd085c
Runtime Error
An exception occured while processing the request.
Additional information: null
Exception ID = 30ebb5e1-fea6-2e10-7d8e-b34b3229cd35
ANy idea what the problem could be?
Thanks and Regards,
Reena

Hello,
Below is an extract from the trace file for the exception ID:
Exception ID = 60843375-7baa-2e10-2097-c764acd6ad4c java.lang.NullPointerException
at com.sapportals.wcm.portal.component.base.ControllerComponent.prepareRequest(ControllerComponent.java:229)
at com.sapportals.wcm.portal.component.base.ControllerComponent.getPage(ControllerComponent.java:124)
at com.sapportals.portal.htmlb.page.PageProcessorComponent.doContent(PageProcessorComponent.java:114)
at com.sapportals.wcm.portal.component.base.ControllerComponent.doContent(ControllerComponent.java:83)
at com.sapportals.portal.prt.component.AbstractPortalComponent.serviceDeprecated(AbstractPortalComponent.java:209)
at com.sapportals.portal.prt.component.AbstractPortalComponent.service(AbstractPortalComponent.java:114)
at com.sapportals.portal.prt.core.PortalRequestManager.callPortalComponent(PortalRequestManager.java:328)
at com.sapportals.portal.prt.core.PortalRequestManager.dispatchRequest(PortalRequestManager.java:136)
at com.sapportals.portal.prt.core.PortalRequestManager.dispatchRequest(PortalRequestManager.java:189)
at com.sapportals.portal.prt.component.PortalComponentResponse.include(PortalComponentResponse.java:215)
at com.sapportals.portal.prt.pom.PortalNode.service(PortalNode.java:645)
at com.sapportals.portal.prt.core.PortalRequestManager.callPortalComponent(PortalRequestManager.java:328)
at com.sapportals.portal.prt.core.PortalRequestManager.dispatchRequest(PortalRequestManager.java:136)
at com.sapportals.portal.prt.core.PortalRequestManager.dispatchRequest(PortalRequestManager.java:189)
at com.sapportals.portal.prt.core.PortalRequestManager.runRequestCycle(PortalRequestManager.java:753)
at com.sapportals.portal.prt.connection.ServletConnection.handleRequest(ServletConnection.java:240)
at com.sapportals.portal.prt.dispatcher.Dispatcher$doService.run(Dispatcher.java:545)
at java.security.AccessController.doPrivileged(AccessController.java:246)
at com.sapportals.portal.prt.dispatcher.Dispatcher.service(Dispatcher.java:434)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:401)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:266)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:386)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:364)
at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:1060)
at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:265)
at com.sap.engine.services.httpserver.server.Client.handle(Client.java:95)
at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:175)
at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(AccessController.java:219)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:104)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:176)
Any clue?
Regards,
Reena

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