Error message

• Notice: Undefined offset: 54 in node_gallery_api_get_item_position() (line 825 of /chroot/home/multiwood2/multiwood.com/html/sites/all/modules/node_gallery/node_gallery_api.inc).
• Notice: Undefined offset: 54 in node_gallery_api_get_item_position() (line 825 of /chroot/home/multiwood2/multiwood.com/html/sites/all/modules/node_gallery/node_gallery_api.inc).
• Notice: Undefined offset: 54 in node_gallery_api_get_item_position() (line 825 of /chroot/home/multiwood2/multiwood.com/html/sites/all/modules/node_gallery/node_gallery_api.inc).