Question juridique clé
Whether the appeal was admissible despite non-payment of the required advance of costs within the set time limit.
Solution extraite
No. The appellant did not pay the advance within the deadline and gave no valid explanation or proof of timely payment, so the appeal could not be entered into.
Motifs extraits
Under the applicable social insurance and cantonal procedural rules, failure to pay the ordered advance of costs after warning leads to non-entry on the appeal.