Error when saving pages

Hi, I'm getting the following error when updating pages: Notice: Undefined index: parallax-frame-sidebar-options in /home/northisl/public_html/wp-content/themes/parallax-frame/inc/metabox.php on line 197 Warning: Cannot modify header information - headers already sent by (output started at /home/northisl/public_html/wp-content/themes/parallax-frame/inc/metabox.php:197) in /home/northisl/public_html/wp-admin/post.php on line 198 Warning: Cannot modify header information - headers already sent by (output started at /home/northisl/public_html/wp-content/themes/parallax-frame/inc/metabox.php:197) in /home/northisl/public_html/wp-includes/pluggable.php on line 1216 What am I doing wrong? What do I need to do to put this right? Thanks Quinn