Pretty much as the title says when setting prices for shop items. When you set a price for a taco its say you need to set a price within the boundaries.
I have the same problem, already checked if the boundaries I was trying to sell at was too high or low but from 0-1400 there is no price it will set at.
Excellent news! This has now been fixed by the development team and will be released in a future server update.
Thanks for doing your bit to help us keep the servers bug free!