Hello djmouse2,
You're encountering this issue due to new Apple limitations on file access. This limitations are applied on any applications distributed on the Appstore (see this article :
http://reviews.cnet.com/8301-13727_7-57444680-263/apples-sandboxing-restrictive-for-some-applications/).
In your case your iTunes library seems to contain tracks outside your ~/Music folder, that's the reason why CrossDJ cannot access them, even for read access.
You will first have to import these tracks into CrossDJ's collection, then resolve their access.
-> resolve their access by opening the File menu and selecting the "Resolve all missing track..." item. Hit the button "Resolve access" and select the parent directory of your non-sandboxed files (like an external drive i.e.).
This should do the job, let me know otherwise.
I will not come to comment these new Apple's limitations here... but be sure these new AppStore constraints are big issues for us developers, and for you DJs in the end... Apple gets finally closer to 1984...
Best regards,
Nicolas.