internal server error

[maxou]

ma config : OVH
prest 1.2.5
module PAYBOX

en payement je recois ceci

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, [email protected] and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

MERCI DE VOTRE ECLAIRAGE 150 000 VOLT (CHAQUE PRESTASHOPIEN EST 1 VOLT non?)

[bechir]

Bonjour,
The server encountered an internal error or misconfiguration and was unable to complete your request.

Votre configuration du module Paybox n'est pas compléte ou fausse