Uncaupt Exception: invalid post_type

Hi there,
we tried to install your plugin, but unfortunately we’re confronted with an error. Are you already aware of it, is there something we need to do to get rid of it? Maybe update a specific setting? We’re working on a multisite, if this helps.

array (
  'internal_server_error' => 
  array (
    'error' => 
    array (
      'type' => 1,
      'message' => 'Uncaught Exception: invalid post_type: page in /var/www/public/wp-content/plugins/affiliate-toolkit-starter/includes/atkp_list.php:87
Stack trace:
#0 /var/www/public/wp-content/plugins/affiliate-toolkit-starter/includes/helper/atkp_template_parameters.php(27): atkp_list::load(\'\')
#1 /var/www/public/wp-content/plugins/affiliate-toolkit-starter/includes/helper/atkp_template_helper.php(127): atkp_template_parameters->__construct(false, \'\', \'\', \'notset\', false, \'\', \'\', \'\', \'\', \'\')
#2 /var/www/public/wp-content/plugins/affiliate-toolkit-starter/includes/helper/atkp_template_helper.php(487): atkp_template_helper->createPlaceholderArray(Object(atkp_product), 1, \'\', \'\', false)
#3 /var/www/public/wp-content/plugins/affiliate-toolkit-starter/includes/atkp_shortcode_generator2.php(962): atkp_template_helper->getPlaceholders()
#4 /var/www/public/wp-content/plugins/affiliate-toolkit-starter/includes/atkp_shortcode_generator2.php(93): atkp_shortcode_generator2->template_detail_box_content(\'\')
#5 /var/www/public/wp-includes/class-wp-hook.php(307): atkp_shortcode_generator2->shortcode_popup(\'\')
#6 /var/www/public/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#7 /var/www/public/wp-includes/plugin.php(474): WP_Hook->do_action(Array)
#8 /var/www/public/wp-admin/admin-footer.php(78): do_action(\'admin_footer\', \'\')
#9 /var/www/public/wp-admin/post.php(369): require_once(\'/var/www/public...\')
#10 {main}
  thrown',
      'file' => '/var/www/public/wp-content/plugins/affiliate-toolkit-starter/includes/atkp_list.php',
      'line' => 87,
    ),
  ),
)