Erreurs 500 après la migration vers K5 - ..Unread.html

Bonjour,

depuis la migration vers la version 5, j'ai plusieurs URL qui donne erreur 500 dans le search consol. Les URL finissent par .unread.html comme indiqué dans la capture d'écran. aucun message d'erreur s,affiche en frondend quand j'active l'affichage des erreurs.

Joomla 3.6.2, K5.0.1 .

merci

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Joomla default template details : jl_amara_pro | author: JoomLead | version: 1.0.3 | creationdate: Feb 2016

Kunena default template details : Crypsis | author: Kunena Team | version: 5.0.1 | creationdate: 2016-08-20

Kunena version detailed: Kunena 5.0.1 | 2016-08-20 [ Binturong ]
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Kunena - AlphaUserPoints Disabled
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Kunena - Joomla Enabled: access=1 login=1
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Joomla! languages installed:
en-GB	English (en-GB)
fr-FR	French (FR)

Third-party components: None

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Plugins: None

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Bonjour,

Si tu entre le ou les urls qui posent problème dans un navigateur, cela devrait t'afficher l'erreur. Tu dois au préalable activer le mode debug dans les panneaux de configuration de Joomla! et Kunena.

Merci de votre réponse. Il me donné une page "Error 500 , Mise en page common/default introuvable"
J'ai d,autres sites sur le même serveur, il ne semble pas avoir du problème.

Il me semble avoir déjà vu cette erreur quelque part mais je ne me souviens plus ou, je vais refaire une recherche