What are the elements of a professional negligence claim?

"The elements of a claim for professional negligence are: ' "(1) the duty of the professional to use such skill, prudence, and diligence as other members of his profession commonly possess and exercise; (2) a breach of that duty; (3) a proximate causal connection between the negligent conduct and the resulting injury; and (4) actual loss or damage resulting from the professional's negligence." ' " (Paul v. Patton (2015) 235 Cal.App.4th 1088, 1095.)