What is the appellant's burden of demonstrating reversible error in denying his petition?

Defendant also complains that the trial court denied his petition "without case file." He contends that we should reverse and remand the matter for a hearing with the court file present. He does not, however, assert that there is any document contained in the court file that would support his claim of eligibility, nor has he sought to augment the record on appeal to include any such document. It is the appellant's burden to "affirmatively demonstrate" reversible error. (People v. Sanghera (2006) 139 Cal.App.4th 1567, 1573.) Here, defendant has not done so.

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