Can you add anyone else to the crewlist or do you receive the same error? If you have your own ship, are you able to add him to that crewlist (to see if the problem lies just with the one ship, or perhaps with faction-owned ships, rather than all ships)?
In the meantime, it would probably be fastest for you to let your faction know and see if they can have someone else add him to the crewlist to bypass this.
Interesting. I just experienced this recently with a couple of faction ships that I was piloting. Only after entering the cockpit of the ship I was trying to give crewlist access too was I able to add the desired person. At first I thought this was a feature, but I may be mistaken.
Edited By: Arc Davaire on Year 7 Day 265 10:33 ____________
Are you set as commander of the ship? You should definitely be able to add names to the crewlist from anywhere as commander. I recall that not being possible some time ago for just the pilot, but I am able to access the management page as pilot now, so that may have changed.
In any case, being told that the handle does not exist is definitely a bug, provided the handle being entered is indeed valid. Please make a bug report detailing under what circumstances that message was received and a programmer will look into it as time permits.