It says 10 records processed, 10 records failed and in the email confirmation of the upload says the
records are invalid. I don't understand why such thing would happen and I don't know how to fix it.
Sorry you're stuck but there's almost always a pretty easy fix! Do NOT try to start all over again, uninstall Max's Pitch Package, etc. That can make it worse. There's a 95% chance the same snag/fix is listed & answered in the Help FAQ. But if you can't find it there, post your problem here.
Make sure you post in the right category below & be sure to include a screencap showing the issue!