SANTA CLARA, Calif. -- The San Francisco 49ers' offense, especially quarterback Colin Kaepernick, has been criticized this week after settling for three field goals in a 10-9 home loss to Carolina.Naturally, offensive coordinator Greg Roman blamed himself Thursday for issues with the unit last Sunday."Anytime we don't have success, it definitely starts with me, and we've got to get it fixed," Roman said. "It's something we're working hard to do.