For many years, independent and self-published authors often turned to CreateSpace and its print-on-demand capabilities to offer paperback versions of their books. However, late last summer, Amazon announced that CreateSpace was going away and being merged with KDP (Kindle Digital Publishing).
Authors with books in CreateSpace were told to migrate their books over to KDP when prompted. Several blog posts recommended that authors try to move their books as soon as possible to avoid problems and/or get any problems fixed before the crush of KDP’s efforts to migrate the remainder.
Or not… Once KDP announced that any books not proactively migrated prior to their deadline would be moved automatically and remain live the whole time, some of us didn’t bother doing the work before the deadline. *raises hand*