What is the test for an appellant to make it affirmatively appear that error was committed by the trial court?

"It is incumbent upon an appellant to make it affirmatively appear that error was committed by the trial court." (Richard v. Richard (1954) 123 Cal.App.2d 900, 902.) An appellant must comply with the rules requiring the appellant's brief to summarize points under appropriate headings in order to facilitate disposition of cases on appeal and direct the court's attention to specific errors of law the appellant contends were committed by

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