Blue Liquid Designs on "[Plugin: Kodex Posts likes] Notice in metabox"

Notice: Array to string conversion in /wp-content/plugins/kodex-posts-likes/admin/partials/metabox.php on line 19

Notice: Array to string conversion in /wp-content/plugins/kodex-posts-likes/admin/partials/metabox.php on line 24

https://wordpress.org/plugins/kodex-posts-likes/

Also getting the following on the post list page:

Notice: Array to string conversion in /wp-content/plugins/kodex-posts-likes/admin/class-kodex-posts-likes-admin.php on line 101