WAD error !!

Hi all,

While saving and executing a template in Web application designer, i am getting following error :

while saving:

this operation could not be performed because of portal communication error

While executing :

There seems to be an error in the communication with the portal that may at least partly cause this issue. This is like to be caused by portal unavailability or a configuration issue

What can be the cause? we have maintained system object for connectivity bet portal and BI server. what could be the cause?

Regards,

Ameya