I have deleted this plugin Count-Per-Day a few months back using the normal WordPress delete plugin procedure, but Google Webmaster tools is still reporting many, and I mean many, "Not Found" errors.
Of course, there is no such folder count-per-day anymore.
Developer of Count-Per-Day, why is this so ? Is there anything else to delete ?
* Your plugin was good, but it was redundant for me as I wanted some of Jetpack's features, which already has Site Stats.