PHP Guestbook Error

Question

I just added a php guestbook to my site, now when I enter it this error message shows:Warning: filesize(): Stat failed for ./LouisSahagunGuestbookdb.php (errno=2 - No such file or directory) in /home/content/p/l/a/planet9/html/LouisSahagun/LouisSahagunGuestbook.php on line 218 No posts found. What is causing this error? I know it's the php guestbook, but I want to keep it or bring a new one, any idea what my next step should be?