When printing Catalogs or Books we require that you give us a document with a number of pages (including the cover) that can be divided by 4. i.e. 4,8,12,16 …etc. This is because to print multipage documents, we us larger paper that is folded and cut. In printers terminology this is called a Saddlestich.

If you have already designed your catalog with an incompatible number of pages, i.e. 10, consider adding some blank pages, or pages with some small amount of content.