[Zope] ImportError

Hello, I tried to delete a old product, which I no longer need. If I try to access a directory which had some instances of this product in it, then I get the following Error: Error Type: ImportError Error Value: No module named ZReportLab2.ZReportLab But I have deleted all instances, I could find with the search routine. I also have packed my Data.fs. What can I do, that I get rid of this old product? Regards Florian Reiser