warning message

Hi,
My site is http://www.mifalda.com.
I have a warning message when I’m updating new posts. It look like this and I don’t know what to do. :

Warning: Missing argument 2 for wp_kses(), called in /home/content/47/11037447/html/wp-content/plugins/responsive-header-image-slider/responsive_headerimageslider.php on line 158 and defined in /home/content/47/11037447/html/wp-includes/kses.php on line 479

Warning: Cannot modify header information – headers already sent by (output started at /home/content/47/11037447/html/wp-includes/kses.php:479) in /home/content/47/11037447/html/wp-admin/post.php on line 229

Warning: Cannot modify header information – headers already sent by (output started at /home/content/47/11037447/html/wp-includes/kses.php:479) in /home/content/47/11037447/html/wp-includes/pluggable.php on line 896