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I only get this error

Translation not found.
[▼
  "id" => "Administration"
  "domain" => "AdminModulesFeature"
  "locale" => "fr-FR"
]

and 

Matched route "admin_module_manage".

[▼
  "route" => "admin_module_manage"
  "route_parameters" => [▼
    "category" => null
    "keyword" => null
    "_controller" => "PrestaShopBundle\Controller\Admin\Improve\ModuleController::manageAction"
    "_legacy_controller" => "AdminModulesManage"
    "_legacy_link" => [▼
      "AdminModulesManage"
      "AdminModulesSf"
    ]
    "_route" => "admin_module_manage"
  ]
  "request_uri" => "my_url/admin/index.php/improve/modules/manage?_token=95Eszc01qKnjQDD01tOw0bCrB_471mL8-201r-PkPSI"
  "method" => "GET"
]

This one is not an error, it says "Infos"