Instant messaging Error in EP 6.0

Hi Guys,

Please can anyone help me. I am having problem with my instant messenger. Whenever I click the link in CLP,It displays a blank page. When I refresh the page, it displays the errors below:-

" Portal Runtime Error

An exception occurred while processing a request for :

iView : com.sap.netweaver.coll.appl.ui.base.UpcmSession

Component Name : com.sap.netweaver.coll.appl.ui.base.UpcmSession

The exception was logged. Inform your system administrator..

Exception id: 01:27_16/07/05_0041_8097650

See the details for the exception ID in the log file "

Thanks

Dakata A. Ibrahim