Hi vaprocura
Are you using version 6? If so, read on.
What is the "error"? Was it an actual error message or was it
possibly a simple advisory saying something along the lines of: The
FileName.book has been created to hold the resources?
If so, crack Windows Explorer open and look at your file
structure. If you see folders ending in .book, your missing topics
should be found inside. From there, you drag them out of the .book
folders and back to where they were initially. Once you do this,
the red x's should disappear and you should be back in business.
Cheers... Rick