there's two conditions for this error..
if you're running a single system, and not noticing any additions to your stats, then delete filelist.txt and start over.
if you're getting points.. then you 'll want to get Howard & Elena's ideas on the subject..
I was given the suggestion of setting up a Yahoo suitcase? account and uploading the zipped client directory to there, and giving them an email with the zipped file location and name.