When a subsequent extension of the return day is granted by the appellate court in accordance with the provisions of Article 2125, notice thereof shall be given by mail by the clerk of the trial court to counsel of record of all parties, and to parties not represented by counsel. The failure of the clerk of the trial court to mail such notice does not affect the validity of the appeal, nor does any error or defect that is not imputable to the appellant affect the validity of the appeal.
La. C.P. § 2125.1