just had quick look - you seem on right lines
try using a fertile green colour for map ground_types instead of the wilderness black, CA said somewhere that every region should have some fertile ground type - don't know if that stops it loading or not though.
if its not that only other thing I can think of is that your regions colours are very close together with only the 1 increment in RGB colour, but I'd see if anyone else can think of anything before you try altering all that!!!!!!
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