Hi! I have located the problem. It is in the embryos.loc file. Part of the creatures that should appear in the church are described wrongly :
{A}{races} = {}
{A}{units} = {witch_hunter,4:2:8,thorn_warrior,30:10:100,thorn, 30:10:100,dryad,10}
{A}{level} = {1}
{A}{kolvo} = {50:10:150}
{U}{prob} = {9}
The boxes {level} and {kolvo} should be empty, because the level and the quantity of the creatures is already defined above. And because there is a probability for creature to appear, I guess when you tested it you got another creature
.
Anyway I guess you already know this stuff, because the mod is quite awesome. I'm enjoying it and I am on the lower trent now. Sad thing is, that there I found another building(citizen house) , which crashes the game. I did not found what's the problem with it so far, but it is not game breaking.