Bonjour,
J'ai le souci suivant en installant SF6

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Executing script cache:clear [KO]
 [KO]
Script cache:clear returned with error code 255
!!  PHP Fatal error:  Declaration of Symfony\Component\Cache\CacheItem::expiresAt(?DateTimeInterface $expiration): Symfony\Component\ErrorHandler\DebugClassLoader must be compatible with Psr\Cache\CacheItemInterface::expiresAt($expiration) in /home/gg/Sites/sheldon-admin/vendor/symfony/cache/CacheItem.php on line 77
!!  Symfony\Component\ErrorHandler\Error\FatalError {#57
!!    -error: array:4 [
!!      "type" => 64
!!      "message" => "Declaration of Symfony\Component\Cache\CacheItem::expiresAt(?DateTimeInterface $expiration): Symfony\Component\ErrorHandler\DebugClassLoader must be compatible with Psr\Cache\CacheItemInterface::expiresAt($expiration)"
!!      "file" => "/home/gg/Sites/sheldon-admin/vendor/symfony/cache/CacheItem.php"
!!      "line" => 77
!!    ]
!!    #message: "Compile Error: Declaration of Symfony\Component\Cache\CacheItem::expiresAt(?DateTimeInterface $expiration): Symfony\Component\ErrorHandler\DebugClassLoader must be compatible with Psr\Cache\CacheItemInterface::expiresAt($expiration)"
!!    #code: 0
!!    #file: "./vendor/symfony/cache/CacheItem.php"
!!    #line: 77
!!  }
!!  
Script @auto-scripts was called via post-update-cmd

Merci de votre aide