It's happening randomly on certain Android devices, but I've fixed it for the next update - in the meantime, you can hit "ignore" and it shouldn't screw anything up. Sorry for the inconvenience!
You don't need to get rid of your saves; you can just ignore them or save over them. If you really want to delete them, though, just move your cursor over the save slot and hit the "del" button on your keyboard :)
The error is related to Noelle's support ability, so it's an "isolated" mechanic that - at worst - just won't give you a COR boost when you use her as a support character. The next update patches the problem, so at worst you'll just have a slightly-malfunctioning Noelle support until then :)
