PHP Core Warning – yii\base\ErrorException

$_GET = [
    'slug' => 'serena-zoli',
    'modelClass' => 'app\\models\\muv\\article\\FuvAuthor',
    'page' => '10',
    'per-page' => '10',
];

$_SESSION = [
    '__flash' => [],
    '__returnUrl' => '/magazine/giornalisti/serena-zoli?page=10&per-page=10',
];