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Unknown Propertyyii\base\UnknownPropertyException

Getting unknown property: app\models\Merchants::confirmmerchantsms

$_GET = [
    'setlanguage' => 'en',
    'id' => '520',
    'slug' => 'book-Azia_Restaurants-Warsaw',
];

$_SESSION = [
    '__flash' => [],
    'language' => 'en',
];