Errors after updating to 3.8

Strict Standards: Declaration of FeedWordPress_Walker_Category_Checklist::start_el() should be compatible with Walker_Category_Checklist::start_el(&$output, $category, $depth = 0, $args = Array, $id = 0) in /var/www/et_blogs/wp-content/plugins/feedwordpress/feedwordpress-walker-category-checklist.class.php on line 13

Strict Standards: Non-static method FeedWordPress::needs_upgrade() should not be called statically in /var/www/et_blogs/wp-content/plugins/feedwordpress/feedwordpress.php on line 145

Strict Standards: Non-static method FeedWordPressCompatibility::link_category_id() should not be called statically, assuming $this from incompatible context in /var/www/et_blogs/wp-content/plugins/feedwordpress/feedwordpress.php on line 1537

These are just a few of the many errors I get with the latest plugin after updating to 3.8.1. And it isn’t the theme, because I tried with WP’s default and it is working. Any ideas on what must be happening here?

https://ww.wp.xz.cn/plugins/feedwordpress/