Minimum Level to Use

Most probably you had modified the default roles capabilities, as the plugin rely on ‘publish_pages’ for Editor which should not be available for Authors ‘publish_posts’. Unfortunate so far there’s no filters which may be used to change those, so probably you may want to hack inside. As alternative consider to upgrade to advanced version which include what you need, additional details on how to be done can be found at https://www.nsp-code.com/advanced-post-types-order-api/filter-add-custom-role-modify-exiting-minimum-capability-to-use-this-plugin/