Error during Knowledge Management startup!

Hi Experts!!

Having the problem while accesing Knowledge Mangagement tree

Error during Knowledge Management startup!

Please contact your system administrator

Additional information: Invalid RID: No repository manager found for prefix: /documents

Exception ID = 306fa5d9-261a-3210-5d85-f730073ed0e8

the defaultTrace.log is

Date : 09/09/2014
Time : 9:00:36:771
Message : Exception ID:09:00_09/09/14_0001_7998150
[EXCEPTION]
com.sapportals.portal.prt.component.PortalComponentException: Error in service call of Portal Component

Component : pcd:portal_content/EBS/CCElectronics/roles/rl.CCElectronics/ws.Template_Structure_0/pg.Today_0/iv.php_disp_url_iview_0

Component class : com.sapportals.portal.httpconnectivity.urliviews.runtime.URLIView

User : Administrator

at com.sapportals.portal.prt.core.PortalRequestManager.handlePortalComponentException(PortalRequestManager.java:973)

at com.sapportals.portal.prt.core.PortalRequestManager.callPortalComponent(PortalRequestManager.java:343)

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:235)

at com.sapportals.portal.prt.dispatcher.Dispatcher$doService.run(Dispatcher.java:557)

at java.security.AccessController.doPrivileged(Native Method)

at com.sapportals.portal.prt.dispatcher.Dispatcher.service(Dispatcher.java:430)

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(Native Method)

at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:104)

at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:176)

Caused by: com.sapportals.portal.prt.runtime.PortalRuntimeException: Can't read the prameter 'siteString' from the PCD.

at com.sapportals.portal.httpconnectivity.urliviews.runtime.URLIView.checkPCDVal(URLIView.java:627)

at com.sapportals.portal.httpconnectivity.urliviews.runtime.URLIView.readFromPCD(URLIView.java:524)

at com.sapportals.portal.httpconnectivity.urliviews.runtime.URLIView.doContent(URLIView.java:326)

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)

... 27 more

Severity : Error
Category : /System/Server
Location : com.sap.portal.portal
Application : sap.com/irj
Thread : SAPEngine_Application_Thread[impl:3]_16
Datasource : 1410250470841:C:\usr\sap\EP2\JC00\j2ee\cluster\server0\log\defaultTrace.trc
Message ID : 00505607E87A006B000000000000031C0005029C7E1156C7
Source Name : com.sap.portal.portal
Argument Objs : com.sapportals.portal.prt.component.PortalComponentException: Error in service call of Portal Component