England scored four tries inside 20 minutes which killed off any chance of the French of making the World Cup quarter-finals.
"We started very badly," Cologni said.
"Our game today - our completion was too poor. The effort was there after 15 or 20 minutes but it's too late.
"We finished very well and showed some good spirit. I appreciate that and the team spirit. But I'm frustrated with our ball control today. We cannot play against England and drop so many balls on the first and second tackle."