Formal rules of evidence or procedure which must be followed in court shall not be applied in zoning matters. No action, inaction, or recommendation regarding any zoning matter by City Staff, Commission, or Council shall be void or invalid, or set aside by any court, on the grounds of the improper admission or rejection of evidence, or by reason of any error, irregularity, informality, neglect, or omission as to any matter pertaining to a petition, application, notice, finding, record, hearing, report, recommendation, or appeal, or any matter of procedure. Unless, after an examination of the entire case, including the evidence, a court shall be of the opinion that the error complained of was prejudicial and that, by reason of such error, the party complaining or appealing sustained and suffered substantial injury, and that a different result would have been probable if such error had not occurred or existed. There shall be no presumption that an error is prejudicial or that injury was done if an error is shown.