nodelet call service failed, how to know where is the service source code so to debug

edit

I'm running ros in raspberry pi instead of PC, the node launched by :

<node pkg="" type="nodelet" name="$(arg name)" args="manager"
        output="screen" launch-prefix="$(arg launch_prefix)" >
     <param name="num_worker_threads" value="$(arg num_worker_threads)" />
  </node>

arg name = camera_nodelet_manager

I debugged nodelet and found service '/camera/camera_nodelet_manager/load_nodelet' call failed.

I want to debug the service, I compiled the ros source code but how do I know which code file to debug?