Role resolution problems when using Appraisee & Appraiser roles

When I use Roles 01000016 & 01000017 (Appraisee & Appraiser), I encounter Role Resolution problem, with the message 'Agent not found for step...' The role type is 'Function to be executed'. Can there be some help on this?

Roles 01000016 & 01000017 are 'Function' role types. This means that the function modules RHPDV_GET_APPRAISEES and RHPDV_GET_APPRAISERS respectively are executed in order to determine the agents. What I would do is debug these roles and the function modules to determine why no agent is being found. Use the 'Simulate Role Resolution' button from the transaction PFAC_DIS.