Actually a crow, or raven is a bird (random bird name), a waitress is a waiter (waiter does split 50% male-female), and a ghost is either: spectre, ghoul, bogle, wraith or shade (just typos or custom "ghost" script).
Beggar is probably a custom script, such as the Renowed monsters stuff, for that part i guess they are scripts that must be added.
Did it throws those in the log after installing a new type of spawner?
>If it is the case then, don't fix anything and search for those scripts, someone probably mentioned it where you took it.