Error message

• Notice: Undefined index: title in theme_book_title_link() (line 368 of /chroot/home/amblesi/amblesideschools.com/html/modules/book/book.module).
• Notice: Undefined index: href in theme_book_title_link() (line 368 of /chroot/home/amblesi/amblesideschools.com/html/modules/book/book.module).