Package. . . Cannot copy necessary linked file(s)

I created a publication based on a previous one. It's in a new folder with the default [fonts] and [lins] subfolders. Preflight shows no linking errors. Since there are numerous unused graphics in the link folder (from the old version), I wish to create a new package before sending to production. I get the above error with no explanation. How do I do this without manually copying every link (70) and font (46)?

This is CS3 on Vista Home Premium.