simple as forgetting to set the doors to manual to set it off when the door was opened?
Will leave that to those that know. All I know is that my daughter was told in training that if they ever make that mistake, walk off the plane, hand in your airside pass and go home to wait for your P45!!!
Even at home base its at least 4 hours to repack or whatever, more if away from base, and its not a cheap exercise. On an equally (more) serious note people on the loading ramps have been seriously injured, or killed by such errors.
Apparently simple maybe, but a very important procedure.................