Good news is that it's not a bug. It just means that you don't have the proper privileges to access the cockpit/control room of the Starport.
To fix this you will need to be given Control Room faction privileges. That should allow you to access the control room for any facilities. Now don't quote me on this, but I do believe being assigned as the operator will also allow you access to the facility's control room. It's very easy to do so you can check it out and see if that works mate.
1) You are merely the owner/commander and have not been assigned as pilot. Generally this means that you can still see the overall cockpit page, but cannot use anything, giving that error. Simply get yourself assigned as pilot. However this will lead to point 2:
2) If you were already in the cockpit room before you were assigned as pilot. This just means that it hasn't been refreshed yet. Simply click on the position interface link, then access the cockpit page again - it should now work. This goes the same for when you NPC-control other ships.