Domain Mapping give error "Domain Name is Invalid"

Domain mapping has been working fine for me for the last several months, even the past year and a half even, but now it doesn't want to map domains anymore. If I type any domain type in I get the error "Domain Name is Invalid" Since the last update I have had trouble with http https redirects going all over the place and now this. Please let me know what I need to do to get it working right