Hello, I am having some problems with my plugin Membership. Every time I try to delete a coupon it

Hello, I am having some problems with my plugin Membership. Every time I try to delete a coupon it returns me the following message at the top of the panel: Warning: Missing argument 1 for M_Coupon::delete(), called in /home/liute/public_html/clubedodesign.com/wp-content/plugins/membership/membershipincludes/classes/membershipadmin.php on line 7367 and defined in /home/liute/public_html/clubedodesign.com/wp-content/plugins/membership/membershipincludes/classes/class.coupon.php on line 453 Warning: Cannot modify header information - headers already sent by (output started at /home/liute/public_html/clubedodesign.com/wp-content/plugins/membership/membershipincludes/classes/class.coupon.php:453) in /home/liute/public_html/clubedodesign.com/wp-includes/pluggable.php on line 876

What is happening? How can I fix this? Thank you!