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Erreur d'erreur HTTP 500 après la sauvegarde des paramètres avancés

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Chaque fois que je clique sur "Save" ou sur "effacer le cache" dans le menu des paramètres avancés du backoffice prstashop, une page vierge s'affiche avec "HTTP ERROR 500" et je ne peux plus utiliser ni accéder à mon backoffice, de sorte à pouvoir utiliser, je dois restaurer les fichiers de sauvegarde. Le support de mon serveur me dit que le log des erreurs est:


[29-Nov-2019 10:29:38 Europe/Rome] PHP Fatal error: Uncaught Symfony\Component\DependencyInjection\Exception\RuntimeException: Cannot dump definition because of invalid class name (NULL) in /home/NOMESITO.COM/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php:1403
Stack trace:
#0 /home/NOMESITO.COM/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php(790): Symfony\Component\DependencyInjection\Dumper\PhpDumper->dumpLiteralClass('NULL')
#1 /home/NOMESITO.COM/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php(394): Symfony\Component\DependencyInjection\Dumper\PhpDumper->addNewInstance('_defaults', Object(Symfony\Component\DependencyInjection\Definition), 'return ', '$this->services...')
#2 /home/NOMESITO.COM/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php(639): Symfony\Component\DependencyInjection\Dumper\PhpDumper->addServiceInstance('_defaults', Object(Symfon in /home/NOMESITO.COM/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php on line 1403



Pourquoi ce problème se pose-t-il et comment puis-je le résoudre?



Edited by Massimo333 (see edit history)

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