Hello
I get this error in cache, btw. great module just what I need.

Code:
PHP Warning:  constant() [<a href='function.constant'>function.constant</a>]: Couldn't find constant MODULE_CATEGORY_DISCOUNT_CALC_TYPE in includes/modules/order_total/ot_category_discount.php on line 27
PHP Warning:  constant() [<a href='function.constant'>function.constant</a>]: Couldn't find constant MODULE_CATEGORY_CALCULATION_TYPE in includes/modules/order_total/ot_category_discount.php on line 31