The approval of the single step SRM workflow : WS10000129 ????

Hi,

I am using single step SRM approval workflow :WS10000129 for shopping cart creation, After creation , the work flow is getting triggered and The Problem is becuase of Agent (in workflow log, it is saying that , Agent determination for step '000000023' failed ).

I activiated all the subworkflows also.Customization ie..General Task is maintained also.

I feel, it is failing to reach a agent ..plz Help me regarding the Issue to go to an agent .

How do we customize the agent for Particular task.

plz Help me..

Balaji.