I had a simliar problem with the cudgel quest in Halas, and
this post pointed me in the right direction.
After you follow the instructions, you can use #reloadpl in-game, although I camped out and relogged on to the server before I did. Seemed to work fine after that. What seems to be happening is the emu can't find the check_handin.pl file because the folder is in the wrong place, so hopefully that will fix things for you.
