need some info:
- install type?
- patched existing or installed fresh?
- tweaked or non-tweaked?
- new game?
- or loaded save?
person,gd, mansion,gd, outside,gd, and globals,gd should have been updated for the variable slave prices to work correctly, and that appears to be the part that is affecting you. Most of the time this kind of error stems from an installation problem.