Question juridique clé
Whether the social insurance appeal was admissible despite non-payment of the ordered advance on costs.
Solution extraite
The appeal was inadmissible because the appellant failed to pay the required advance within the initial and additional deadlines.
Motifs extraits
Under Art. 62 LTF, the court may require an advance of costs and must set an additional deadline if payment is not made; failure to pay within that second deadline makes the appeal inadmissible.