wrror while creating yahooiview

HI experts,

iam trying to create yahoo iview..

i have create system object using webapplication template.

and created iview .. when i click preview.. i am getting error:

\Portal Runtime Error

An exception occurred while processing a request for :

iView : pcd:portal_content/surekha/yahooinbox

Component Name : com.sap.portal.appintegrator.sap.Generic

Exception in SAP Application Integrator occured: Application URL 'HTTP://' is not valid! Please check the protocol and host entries for system 'yahoosystem'..

Exception id: 03:43_26/07/07_0008_9487750

See the details for the exception ID in the log file

my portal is 7.0

i worked fine with ep6.0 sp2.

Plz let me know the problem..

THanks in advance.