Sporadic error after AWE approvals..

Hi Gurus -

I am getting the attached error on AWE approvals. This is a custom AWE which is working fine (till all approvals are obtained). However, I am attempting to call a package once all the approvals are obtained to transfer the data and it was throwing this error then. The package it has been calling is delivered and does exist in the database.

I thought it was cache issue in the environment I was testing and bounced the app server cache. The error was GONE. However, I migrated the code to next environment and get the same error showing up.