Fatal error: Call to a member function getStoreContCount() on a non-object in E:\xampp\htdocs\traffic-crs\controllers\storeController.php on line 91

    public function getStoreContCount($id) {
        $cont_by_store = $this->_db->query("SELECT COUNT(*) FROM cont WHERE store_id = $id");
        if (!$cont_by_store->fetch()) {
            return false;
        }
        return true;
    }

if ($this->model->getStoreContCount($this->filterInt($id))) {
       $this->_view->assign('_error', 'Вы не можете удалить склад, т.к. в нем есть контейнера.');
       $this->_view->renderizer('index');
       exit;
} 

<?php
class storeModel extends Model {
    public function __construct() {
        parent::__construct();
    }
    
    public function verificationStoreName($store_name) {
        $id = $this->_db->query("SELECT store_id FROM store WHERE store_name ='$store_name'");
        if ($id->fetch()) {
            return true;
        }
        return false;
    } /* метод-проверка на одинаковое имя склада */

    public function getStores() {
        $stores = $this->_db->query("SELECT * FROM store");
        return $stores->fetchAll();
    }
    
    public function getStoreById($id) {
        $store_by_id = $this->_db->query("SELECT * FROM store WHERE store_id = $id");
        return $store_by_id->fetch();
    }
    
    public function getStoreContCount($id) {
        $cont_by_store = $this->_db->query("SELECT COUNT(*) FROM cont WHERE store_id = $id");
        if (!$cont_by_store->fetch()) {
            return false;
        }
        return true;
    }
    
    public function insertStore($store_name) {
            $this->_db
                    ->prepare("INSERT INTO store VALUES(NULL, :store_name)")
                    ->execute (array(':store_name' => $store_name));
    }
    
    public function editStore($store_id, $store_name) {
            $this->_db->prepare(
                        "UPDATE store SET store_name = :name WHERE store_id = :id")
                    ->execute (array(
                        ':id' => $store_id,
                        ':name' => $store_name));
    }
    
    public function deleteStore($store_id) {
            $this->_db->prepare("DELETE FROM store WHERE store_id = :id")
                      ->execute (array(':id' => $store_id));
    }
}