What is the obligation of an appellant to provide a record adequate to demonstrate error occurred in the trial court?

One other principle is relevant to our review of this matter. It is the appellant's obligation to provide this court with a record adequate to demonstrate error occurred in the trial court. (Estrada v. Ramirez (1999) 71 Cal.App.4th 618, 620, fn. 1.) Failure to do so precludes review and results in affirmance of the trial court's order. (Ibid.) This principle is significant because the record in this case does not contain any of mother's pleadings and omits at least some of the trial court's rulings.