Does a plaintiff have the burden to show error when they argue only generalities?

must be considered in determining a dangerous condition fail to carry the burden to show error. In arguing only generalities, plaintiffs' briefs do not contain "argument and citations to authority as to why the trial court's evidentiary rulings were wrong." (Villanueva v. City of Colton (2008) 160 Cal.App.4th 1188, 1198.) "We are not required to search the record to ascertain whether it contains support for [plaintiffs'] contentions." (Mansell v. Board of Administration (1994) 30 Cal.App.4th 539, 545.)