Make sure you have a few open spots in your inventory, click on the text that says pending and accept the awards for completing the quest. edit: if this mission gives you a choice of objects, make sure you select one so the accept button isn't greyed out.

I am trying to complete the bonus mission Crisis Control for the Crisis in Galactic City on Coruscant. The Guild Leader NPC is not spawning at the location on the map. Anyone else have similar trouble? How are you supposed to complete a mission when the person isn't there?