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Hola tengo un tienda y luego de activar la caché me parece este error a intentar entrar al back. Mi prestahop es la version 1.7

Fatal error: Uncaught Symfony\Component\DependencyInjection\Exception\RuntimeException: Cannot dump definition because of invalid class name (NULL) in /homepages/17/d728508947/htdocs/clickandbuilds/PrestaShop/tienda_nombredelatienda/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php:1403 Stack trace: #0 /homepages/17/d728508947/htdocs/clickandbuilds/PrestaShop/tienda_nombredelatienda/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php(790): Symfony\Component\DependencyInjection\Dumper\PhpDumper->dumpLiteralClass('NULL') #1 /homepages/17/d728508947/htdocs/clickandbuilds/PrestaShop/tienda_nombredelatienda/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 /homepages/17/d728508947/htdocs/clickandbu in /homepages/17/d728508947/htdocs/clickandbuilds/PrestaShop/tienda_nombredelatienda/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php on line 1403

Alguien sabe como solucionarlo para poder acceder al backoffice nuevamente. Gracias.