grocerycrud render не отображает таблицу

Question

Когда я выполняю этот код GroceryCrud PHP:

$crud = new grocery_CRUD();

$crud->set_theme('flexigrid');
$crud->set_table('store');
$crud->set_subject('Store');

$output = $crud->render();

echo "<pre>Here is the table:";
print_r($output);
echo "</pre>";
die();

Я получаю следующий вывод, хотя таблица "store" существует в базе данных и в ней есть одна запись:

Here is the table:stdClass Object
(
    [js_files] => Array
        (
            [32fd432b4478200b5aacd62b65d5bdc269337910] => http://www.everythingnow.uk/assets/grocery_crud/js/jquery-1.11.1.min.js
            [c7339f3bd6b575a9439e9d03677a69f742a52379] => http://www.everythingnow.uk/assets/grocery_crud/js/jquery_plugins/jquery.noty.js
            [664ddadc07d0d7e4933e1295d352922418e257a8] => http://www.everythingnow.uk/assets/grocery_crud/js/jquery_plugins/config/jquery.noty.config.js
            [1e5c41adc3783d74df037a01f5c2175a824705a1] => http://www.everythingnow.uk/assets/grocery_crud/js/common/lazyload-min.js
            [d04ba7f0d55dda1d4ba9b6532414c653c58b0318] => http://www.everythingnow.uk/assets/grocery_crud/js/common/list.js
            [2d2b031fb606852768dc4c9a3c457545558cc924] => http://www.everythingnow.uk/assets/grocery_crud/themes/flexigrid/js/cookies.js
            [6629a324ade6d489aff77292cb02e31d9188a6bb] => http://www.everythingnow.uk/assets/grocery_crud/themes/flexigrid/js/flexigrid.js
            [5238a822ff2c6cced38a61590ac6debcc847bc0b] => http://www.everythingnow.uk/assets/grocery_crud/js/jquery_plugins/jquery.form.min.js
            [41101518af3f8fb416f60152aa019d963ae9293b] => http://www.everythingnow.uk/assets/grocery_crud/js/jquery_plugins/jquery.numeric.min.js
            [8823261dedf8eda49cfa2a7a528b5182350a90ae] => http://www.everythingnow.uk/assets/grocery_crud/themes/flexigrid/js/jquery.printElement.min.js
            [6279df8612f557f3151c02ed3dfc5d97f491e9cf] => http://www.everythingnow.uk/assets/grocery_crud/js/jquery_plugins/jquery.fancybox-1.3.4.js
            [d24105860047fc8ef3893d8892bb13d5cb2e8455] => http://www.everythingnow.uk/assets/grocery_crud/js/jquery_plugins/jquery.easing-1.3.pack.js
            [2ea588263ae884c476a96f40dc6cedd5316bbd57] => http://www.everythingnow.uk/assets/grocery_crud/js/jquery_plugins/ui/jquery-ui-1.10.3.custom.min.js
        )

    [js_lib_files] => Array
        (
            [32fd432b4478200b5aacd62b65d5bdc269337910] => http://www.everythingnow.uk/assets/grocery_crud/js/jquery-1.11.1.min.js
            [c7339f3bd6b575a9439e9d03677a69f742a52379] => http://www.everythingnow.uk/assets/grocery_crud/js/jquery_plugins/jquery.noty.js
            [664ddadc07d0d7e4933e1295d352922418e257a8] => http://www.everythingnow.uk/assets/grocery_crud/js/jquery_plugins/config/jquery.noty.config.js
            [1e5c41adc3783d74df037a01f5c2175a824705a1] => http://www.everythingnow.uk/assets/grocery_crud/js/common/lazyload-min.js
            [d04ba7f0d55dda1d4ba9b6532414c653c58b0318] => http://www.everythingnow.uk/assets/grocery_crud/js/common/list.js
            [2ea588263ae884c476a96f40dc6cedd5316bbd57] => http://www.everythingnow.uk/assets/grocery_crud/js/jquery_plugins/ui/jquery-ui-1.10.3.custom.min.js
        )

    [js_config_files] => Array
        (
        )

    [css_files] => Array
        (
            [f1731e27afe02ab899b16daf8ae4a5ac8ac05d4e] => http://www.everythingnow.uk/assets/grocery_crud/themes/flexigrid/css/flexigrid.css
            [ed7c731212886ffa5071a6db738fbff8be24bfa6] => http://www.everythingnow.uk/assets/grocery_crud/css/jquery_plugins/fancybox/jquery.fancybox.css
            [3e3f44ffabdcdd9017fa9db5262ce0465dde1322] => http://www.everythingnow.uk/assets/grocery_crud/css/ui/simple/jquery-ui-1.10.1.custom.min.css
        )

    [output] => 

Я проверил, что crud загружается нормально и подключается к таблице "store" в базе данных.

У кого-нибудь есть идея относительно того, почему продуктовый магазин не рендерит стол?