Ошибка при загрузке товаров

Добрый день,

При загрузке товаров плагин выдает такую ошибку:

#0  wc1c_error(WP Error: duplicate_term_slug: The slug 
“mati-ru” is already in use by another term., WP Error) 
called at 
[/home2/stellina/public_html/wp-content/plugins/woocommerce-and-1centerprise-data-exchange/exchange.php:171]
#1  wc1c_wp_error(WP_Error Object ([errors] => Array 
([duplicate_term_slug] => Array ([0] => The slug “mati-ru” 
is already in use by another term.)),[error_data] => Array ())) called 
at 
[/home2/stellina/public_html/wp-content/plugins/woocommerce-and-1centerprise-data-exchange/exchange.php:175]
#2  wc1c_check_wp_error(WP_Error Object ([errors] => Array 
([duplicate_term_slug] => Array ([0] => The slug “mati-ru” 
is already in use by another term.)),[error_data] => Array ())) called 
at 
[/home2/stellina/public_html/wp-content/plugins/woocommerce-and-1centerprise-data-exchange/exchange/import.php:340]
#3  wc1c_replace_term(1, 1018a07e-d16e-11db-b82f-00138ff1642c, , MATI 
(2), product_cat, 1) called at 
[/home2/stellina/public_html/wp-content/plugins/woocommerce-and-1centerprise-data-exchange/exchange/import.php:354]
#4  wc1c_replace_group(1, Array ([ИдРодителя] => ,[Ид] => 
1018a07e-d16e-11db-b82f-00138ff1642c,[Наименование] => MATI), 1, Array 
([0] => Array ([ИдРодителя] => ,[Ид] => 
1018a07e-d16e-11db-b82f-00138ff1642c,[Наименование] => MATI))) called at 
[/home2/stellina/public_html/wp-content/plugins/woocommerce-and-1centerprise-data-exchange/exchange/import.php:27]
#5  wc1c_import_start_element_handler(1, Array ([0] => 
КоммерческаяИнформация,[1] => Классификатор,[2] => Группы,[3] => 
Группа,[4] => Группы), 4, Группы, Array ()) called at 
[/home2/stellina/public_html/wp-content/plugins/woocommerce-and-1centerprise-data-exchange/exchange.php:360]
#6  wc1c_xml_start_element_handler(Resource id #1428, Группы, Array ())
#7  xml_parse(Resource id #1428, <?xml version="1.0" encoding="UTF-8"?>

С чем это может быть связано, и как это можно исправить?
Заранее спасибо за ответ.