You need a minimum price first before turning on repricing.
In order for SmartPrice to make safe repricing decisions, it needs to know what your lowest acceptable listing price is. Due to that safeguard, SmartPrice will not allow repricing to be turned on for a listing that is missing a minimum price.
Establish a minimum price for the listing, and try to turn on repricing again. The quickest way to establish a minimum price is to enter Editing Mode and type in a minimum price in the User-Defined Minimum Price column.
If you try this and still have difficulties, contact us.