🚀 go-pugleaf

The message means that a color named "Color8" is defined in
more than one of the files in the book, and that the definition
differs between the files. This could be highly undesirable if
the color is being used and you are doing color productions.
The remedy is to make all color definitions the same in all
files by importing color definitions to the entire book.
BTW, the message is a warning and should not prevent you from
printing the book.

If you're familiar with the files in the book, and you feel
confident that "Color8" is not used for anything important,
and you're not doing high-quality color productions, then:

1. In the book window, select all the files in the book.
2. In the book windows, select File > Import > Formats
3. Deselect everything except "color definitions"
4. At the top, select the file you copied from Windows in
   "import from document"
5. Click "import"
6. Save all files and try printing again.

If you're not familiar with the files and you're not sure if
"Color8" could be used for anything important, you should
either consult with someone who designed the files, or at
least select one of the other files in the book to import
colors from. In this case, find a file in the book that contains
the color "Color8" (use View > Color > Definition). Once you've
found such a file, follow the instructions above and use this
file to import colors from.

Even better is if you have access to a template file for the
book that contains all definitions of formats. Then open that
file in FM and use it to import from.

-- 
/Thomas Michanek