'Fault' in the Bible

Then was Abner very wroth for the words of Ish-bosheth, and said, Am I a dog's head that belongeth to Judah? This day do I show kindness unto the house of Saul thy father, to his brethren, and to his friends, and have not delivered thee into the hand of David; and yet thou chargest me this day with a fault concerning this woman.