What is the husband's burden of proving that a family court error concerning changed circumstances was prejudicial?

Husband does not raise an argument as to why the family court's error concerning changed circumstances was prejudicial. We cannot reverse a judgment unless the error resulted in prejudice, i.e., "it is reasonably probable that a result more favorable to the appealing party would have been reached in the absence of the error." (In re Dakota J. (2015) 242 Cal.App.4th 619, 630.) It is the appellant's burden to demonstrate prejudice. (Kern County Dept. of Child Support Services v. Camacho (2012) 209 Cal.App.4th 1028, 1036.)