We finally reproduced the issue. Please try full URL path to your SOAP like http://magento.com/index.php/api/soap/?wsdl. This will solve your issue. @chaosratt, sorry to disappoint you. Will add this instruction in plugin settings.
How to solve this error
Fatal error: Uncaught SoapFault exception: [WSDL] SOAP-ERROR: Parsing WSDL: Couldn’t load from ‘http://127.0.0.1/mg_shop/blog’ : Entity ‘copy’ not defined in C:\xampp\htdocs\mg_shop\wp\wp-content\plugins\mage-wp-sync\lib\sync_categories_from_magento.php:17 Stack trace: #0 C:\xampp\htdocs\mg_shop\wp\wp-content\plugins\mage-wp-sync\lib\sync_categories_from_magento.php(17): SoapClient->SoapClient(‘http://127.0.0….’) #1 C:\xampp\htdocs\mg_shop\wp\wp-content\plugins\mage-wp-sync\lib\sync_categories_from_magento.php(101): TransferCategories::transferring_categories() #2 C:\xampp\htdocs\mg_shop\wp\wp-content\plugins\mage-wp-sync\includes\TransferData.php(15): require_once(‘C:\\xampp\\htdocs…’) #3 [internal function]: transferdata_from_magento(”) #4 C:\xampp\htdocs\mg_shop\wp\wp-includes\plugin.php(525): call_user_func_array(‘transferdata_fr…’, Array) #5 C:\xampp\htdocs\mg_shop\wp\wp-admin\admin-ajax.php(89): do_action(‘wp_ajax_transfe…’) #6 {main} thrown in C:\xampp\htdocs\mg_shop\wp\wp-content\plugins\mage-wp-sync\lib\sync_categories_from_magento.php on line 17
