Portal Runtime exception after SAP EP Upgrade

Hi Experts,

We have recently upgraded our Portal system from NW 7.3 to 7.4 and we could see the below exception message in our portal homepage :

Upon cheking the respective default trace file could see the below message :

Upon checking for the portal content the default trace refering to I couldn't see anything as such added under the "WalmartSystems" folder, not sure if that's the issue :

Kindly suggest how to resolve this as I am pretty new to portal related issues.

Thanks in Advance !!!