UWL tasks are not working in the ESS role

Hi experts,

We have requirement where the the users will have UWL iview in the ESS role in portal to approve the leave req etc.Inorder to achieve that i have copied the standard UWL iview into my custom folder and assigned it to the ESS role, the issue when i click on any task of the leave request in the UWL i am getting the portal runtime error

I have checked the trace in the NWA below is the detailed errorr

But when i apply the ESS&MSS role to the same user i am able to launch the leave request application to approve/reject , i am getting the error when i assign the ESS role i am getting the above errror

Can anyone help on this ???

THanks,

Anil