Is it complaining about lack of a packlist file, or a package.lst, file? If it's the latter, such a file is an xml file listing all packages available in the repository, obtained from the information in the ppd files. The format of this (and some other summary files used by ppm) is described in the documentation for PPM::Make::RepositorySummary, which can be used to generate such files.

In reply to Re: What is the format of a .packlist file for a PPM repository? by randyk
in thread What is the format of a .packlist file for a PPM repository? by LittleGreyCat

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