increase size or number of towns

[EpicSpire]

i tried to increase the spawning of towns, but my lack of understanding broke my game.. luckily i saved a copy of the rwgmixer.xml. this is what my code was

<wilderness_rules>
	<wilderness_rule name="default">
		<prefab_rule name="wildernessGroup"/>
		<prefab_rule name="townGroup"prob="0.15">	<!-- added for test more towns n traders-->	
		<prefab_rule name="traderGroup"prob="0.15"> <!-- added for test more towns n traders-->

	</wilderness_rule>
</wilderness_rules>

i thought this would trigger a chance to spawn a town or trader group in any cell that the game has determined was wilderness.. but i get red errors in the debug menu. something object of instance or something, i forgot to write it down, thought i'd remember it..