Question juridique clé
Whether the appeal fee advance was validly notified with a supplementary deadline under Art. 101 CPC
Solution extraite
The cantonal court did not prove that the supplementary deadline notice was notified to the appellant.
Motifs extraits
The burden of proving notification lay with the authority relying on it. Since the notice was sent by ordinary mail and the appellant denied receipt, with no further indicia, notification was not established.