No master pages applied because MasterPageMaps table contains no mapping information

I use FM8 and DITA files to create my books. I have tired in the past to apply masters automatically but have not been able to. Now that I create books from xml, it is even more important to automate this process. I use structured FM and have deleted and re-created the StructMasterPageMaps in my file. I created a book that has my one test file so I can experiment quickly. In that file I have a Master page defined as Chapter_cover which I can apply manually no problem. In the StructMasterPageMap, I refer to the paragraph tag title.0 and the right-hand MasterPage Chapter_cover and set the range to Single.

When I then select the book and try to update the master pages (Update book->Master Pages->update), I get the error "No master pages applied because the MasterPageMaps table contains no mapping information.

I have searched the forum and the archive and found an instance similar to mine (Jun19/07), but no clear resolution was found. I have tried the suggestions made therein such as re-creating the MasterPages reference page, which I have done. And I am sure that I have typed them correctly (case sensitive etc).

What could be my problem? I could send the book since it consists of only one 2-page fm file.

Thanks in advance for any help,
Kevin