No operations available

After some learning and the acceptance of some minor glitches, I am very satisfied with VBO. However today something strange happened.
I made a view with ubercart orders, but when I wanted to select an operation, none were available. There is a button 'Selected operations', but clicking on it produces nothing. When I then try to save the view I get the following warning:

    warning: Invalid argument supplied for foreach() in /home/theorichel/domains/grkmain.com/public_html/sites/all/modules/views_bulk_operations/views_bulk_operations_plugin_style.inc on line 160.
    warning: Invalid argument supplied for foreach() in /home/theorichel/domains/grkmain.com/public_html/sites/all/modules/views_bulk_operations/views_bulk_operations_plugin_style.inc on line 176.
    warning: Invalid argument supplied for foreach() in /home/theorichel/domains/grkmain.com/public_html/sites/all/modules/views_bulk_operations/views_bulk_operations_plugin_style.inc on line 249.
    warning: Invalid argument supplied for foreach() in /home/theorichel/domains/grkmain.com/public_html/sites/all/modules/views_bulk_operations/views_bulk_operations_plugin_style.inc on line 249.

For completeneess, I paste the export of the current view

$view = new view;
$view->name = 'SponsorsStralingsvideo';
$view->description = '';
$view->tag = '';
$view->base_table = 'uc_orders';
$view->human_name = 'SponsorsStralingsvideo';
$view->core = 6;
$view->api_version = '3.0';
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */

/* Display: Defaults */
$handler = $view->new_display('default', 'Defaults', 'default');
$handler->display->display_options['use_more_text'] = 'meer';
$handler->display->display_options['access']['type'] = 'none';
$handler->display->display_options['cache']['type'] = 'none';
$handler->display->display_options['query']['type'] = 'views_query';
$handler->display->display_options['exposed_form']['type'] = 'basic';
$handler->display->display_options['exposed_form']['options']['reset_button_label'] = 'Terugzetten';
$handler->display->display_options['pager']['type'] = 'none';
$handler->display->display_options['pager']['options']['offset'] = '0';
$handler->display->display_options['style_plugin'] = 'bulk';
$handler->display->display_options['style_options']['columns'] = array(
  'primary_email' => 'primary_email',
  'order_total' => 'order_total',
);
$handler->display->display_options['style_options']['default'] = '-1';
$handler->display->display_options['style_options']['info'] = array(
  'primary_email' => array(
    'sortable' => 0,
    'default_sort_order' => 'asc',
    'align' => '',
    'separator' => '',
  ),
  'order_total' => array(
    'sortable' => 0,
    'default_sort_order' => 'asc',
    'align' => '',
    'separator' => '',
  ),
);
$handler->display->display_options['style_options']['override'] = 1;
$handler->display->display_options['style_options']['sticky'] = 0;
$handler->display->display_options['style_options']['empty_table'] = 0;
$handler->display->display_options['style_options']['execution_type'] = '1';
$handler->display->display_options['style_options']['display_type'] = '1';
$handler->display->display_options['style_options']['display_result'] = 1;
$handler->display->display_options['style_options']['merge_single_action'] = 1;
$handler->display->display_options['style_options']['hide_selector'] = 0;
$handler->display->display_options['style_options']['preserve_selection'] = 0;
/* Field: Ubercart order: Emailadres */
$handler->display->display_options['fields']['primary_email']['id'] = 'primary_email';
$handler->display->display_options['fields']['primary_email']['table'] = 'uc_orders';
$handler->display->display_options['fields']['primary_email']['field'] = 'primary_email';
$handler->display->display_options['fields']['primary_email']['label'] = '';
$handler->display->display_options['fields']['primary_email']['alter']['alter_text'] = 0;
$handler->display->display_options['fields']['primary_email']['alter']['make_link'] = 0;
$handler->display->display_options['fields']['primary_email']['alter']['absolute'] = 0;
$handler->display->display_options['fields']['primary_email']['alter']['external'] = 0;
$handler->display->display_options['fields']['primary_email']['alter']['replace_spaces'] = 0;
$handler->display->display_options['fields']['primary_email']['alter']['trim_whitespace'] = 0;
$handler->display->display_options['fields']['primary_email']['alter']['nl2br'] = 0;
$handler->display->display_options['fields']['primary_email']['alter']['word_boundary'] = 1;
$handler->display->display_options['fields']['primary_email']['alter']['ellipsis'] = 1;
$handler->display->display_options['fields']['primary_email']['alter']['strip_tags'] = 0;
$handler->display->display_options['fields']['primary_email']['alter']['trim'] = 0;
$handler->display->display_options['fields']['primary_email']['alter']['html'] = 0;
$handler->display->display_options['fields']['primary_email']['element_label_colon'] = 1;
$handler->display->display_options['fields']['primary_email']['element_default_classes'] = 1;
$handler->display->display_options['fields']['primary_email']['hide_empty'] = 0;
$handler->display->display_options['fields']['primary_email']['empty_zero'] = 0;
$handler->display->display_options['fields']['primary_email']['hide_alter_empty'] = 1;
$handler->display->display_options['fields']['primary_email']['link_to_user'] = '0';
/* Field: Ubercart order: Totaal */
$handler->display->display_options['fields']['order_total']['id'] = 'order_total';
$handler->display->display_options['fields']['order_total']['table'] = 'uc_orders';
$handler->display->display_options['fields']['order_total']['field'] = 'order_total';
$handler->display->display_options['fields']['order_total']['label'] = '';
$handler->display->display_options['fields']['order_total']['alter']['alter_text'] = 0;
$handler->display->display_options['fields']['order_total']['alter']['make_link'] = 0;
$handler->display->display_options['fields']['order_total']['alter']['absolute'] = 0;
$handler->display->display_options['fields']['order_total']['alter']['external'] = 0;
$handler->display->display_options['fields']['order_total']['alter']['replace_spaces'] = 0;
$handler->display->display_options['fields']['order_total']['alter']['trim_whitespace'] = 0;
$handler->display->display_options['fields']['order_total']['alter']['nl2br'] = 0;
$handler->display->display_options['fields']['order_total']['alter']['word_boundary'] = 1;
$handler->display->display_options['fields']['order_total']['alter']['ellipsis'] = 1;
$handler->display->display_options['fields']['order_total']['alter']['strip_tags'] = 0;
$handler->display->display_options['fields']['order_total']['alter']['trim'] = 0;
$handler->display->display_options['fields']['order_total']['alter']['html'] = 0;
$handler->display->display_options['fields']['order_total']['element_label_colon'] = 1;
$handler->display->display_options['fields']['order_total']['element_default_classes'] = 1;
$handler->display->display_options['fields']['order_total']['hide_empty'] = 0;
$handler->display->display_options['fields']['order_total']['empty_zero'] = 0;
$handler->display->display_options['fields']['order_total']['hide_alter_empty'] = 1;
$handler->display->display_options['fields']['order_total']['set_precision'] = 0;
$handler->display->display_options['fields']['order_total']['precision'] = '0';
$handler->display->display_options['fields']['order_total']['format_plural'] = 0;
$handler->display->display_options['fields']['order_total']['revision'] = 'themed-original';
/* Filter: Ubercart order product: SKU */
$handler->display->display_options['filters']['model']['id'] = 'model';
$handler->display->display_options['filters']['model']['table'] = 'uc_order_products';
$handler->display->display_options['filters']['model']['field'] = 'model';
$handler->display->display_options['filters']['model']['value'] = 'stralingsvid';
$handler->display->display_options['filters']['model']['case'] = 1;
$translatables['SponsorsStralingsvideo'] = array(
  t('Defaults'),
  t('meer'),
  t('Apply'),
  t('Terugzetten'),
  t('Sort by'),
  t('Asc'),
  t('Desc'),
  t('.'),
  t(','),
);