>>256
Okay it werks now.
If a media appears to be broken it have to be scrubbed with the deletion menu first, then repost, this should solve the problem.
The reason is that many media were corrupted in a botched migration of the db some time ago. And lynxchan doesn't uploads media if it's already in the db, just links it there, and if that particular one is corrupted, that results in the error.