I'm getting this http://pastie.org/8182585

Using latest devbuild of preciousstones (b310)
spigot version b1040

Its trying to load a boolean field flag in the config and its finding something other than a boolean there. So its something you messed up in the force-field-blocks list. I suggest you remove all your configured fields and add them back one by one testing to see which one is the one with the bad flag on it.

wow... I'm an idiot. I'll try to fix it. I should stop being so lazy when I see a stacktrace.

EDIT: It was an undefined boolean. Sorry :S