Fatal error: Cannot redeclare M_setup_contactform_shortcode() (previously declared in

I have tried to activate the membership plug in and got this error. supporter plugin is active. trying to use them together.
Fatal error: Cannot redeclare M_setup_contactform_shortcode() (previously declared in /home/xxxxxx/public_html/wp-content/plugins/membership/membershipincludes/plugins/contactsform.php:11) in /home/xxxxxx/public_html/wp-content/plugins/membership/membershipincludes/plugins/contactsformshortcode.php on line 14