License Question

[Charlie]

I am currently creating a package and there is a question about
licenses.  The MOTU who reviewed my package wrote:

"debian/copyright has references to both CC-BY-NC-ND and the GPL. I’m
not sure that code licensed this way can be mixed in a single package."

I have been on IRC #ubuntu-motu and I cannot get a satisfactory answer.

Are these two licenses compatable?

Can they be packaged together?

Thank You

Charlie