Does anyone know why when running the feed creation I'm getting this message for all products?

Processing: Feed - Yes, Upload - No

id: 570, price: 0, description length: 127 - skipped: price below zero, description length less than 15 chars, or title less than 3 chars - failed

id: 571, price: 0, description length: 122 - skipped: price below zero, description length less than 15 chars, or title less than 3 chars - failed

id: 572, price: 0, description length: 124 - skipped: price below zero, description length less than 15 chars, or title less than 3 chars - failed

id: 573, price: 0, description length: 264 - skipped: price below zero, description length less than 15 chars, or title less than 3 chars - failed

Help very much appreciated.