It appears that i am encountering a fatal error in my WordPress installation. The error message indicates that there is a problem with the interaction between the WCP Folders plugin and the MailPoet plugin. The error occurs because the WCP Folders plugin is trying to call a method “mailpoet_conflict_whitelist_style” which does not exist.
Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class WCP_Folders does not have a method “mailpoet_conflict_whitelist_style” in /www/htdocs/w00eab08/kj/wp-includes/class-wp-hook.php:308 Stack trace: #0 /www/htdocs/w00eab08/kj/wp-includes/plugin.php(205): WP_Hook->apply_filters(Array, Array) #1 [internal function]: apply_filters(‘mailpoet_confli…’, Array) #2 /www/htdocs/w00eab08/kj/wp-content/plugins/mailpoet/lib/WP/Functions.php(49): call_user_func_array(‘apply_filters’, Array) #3 /www/htdocs/w00eab08/kj/wp-content/plugins/mailpoet/lib/Util/ConflictResolver.php(94): MailPoet\WP\Functions->applyFilters(‘mailpoet_confli…’, Array) #4 /www/htdocs/w00eab08/kj/wp-includes/class-wp-hook.php(308): MailPoet\Util\ConflictResolver->resolveStylesConflict(”) #5 /www/htdocs/w00eab08/kj/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(”, Array) #6 /www/htdocs/w00eab08/kj/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #7 [internal function]: do_action(‘mailpoet_confli…’) #8 /www/htdocs/w00eab08/kj/wp-content/plugins/mailpoet/lib/WP/Functions.php(36): call_user_func_array(‘do_action’, Array) #9 /www/htdocs/w00eab08/kj/wp-content/plugins/mailpoet/lib/Config/Menu.php(141): MailPoet\WP\Functions->doAction(‘mailpoet_confli…’) #10 /www/htdocs/w00eab08/kj/wp-includes/class-wp-hook.php(308): MailPoet\Config\Menu->setup(”) #11 /www/htdocs/w00eab08/kj/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array) #12 /www/htdocs/w00eab08/kj/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #13 /www/htdocs/w00eab08/kj/wp-admin/includes/menu.php(155): do_action(‘admin_menu’, ”) #14 /www/htdocs/w00eab08/kj/wp-admin/menu.php(420): require_once(‘/www/htdocs/w00…’) #15 /www/htdocs/w00eab08/kj/wp-admin/admin.php(158): require(‘/www/htdocs/w00…’) #16 {main} thrown in /www/htdocs/w00eab08/kj/wp-includes/class-wp-hook.php on line 308