conflicting book id #s

[G-Force]

I have been trying to import a number of zip files and I keep getting the message that my book id has already been used. I am using a batch import, so the message pops up and tells me to chose another book id. I hit ok and the error message just pops up again before I get a chance to try a new id#. I have to cntrl alt delete to close the program. I then went into edit songs and pulled up the bad book id #. I found that it listed both jvc and sc tracks under one id #. Considering I had just imported both the jvc and sc tracks tonight, but at separate times...they were in separate folders, what the heck is going on and how can I fix it so I can import the rest of my files? This is ridiculously annoying and frustrating. I tried rebuilding the db, but that was no help. Still had the same problem.