getting error with spam module all of a sudden. files are intact. "Fatal error: Call to undefined function spam_delete_guestbook

Fatal error: Call to undefined function spam_delete_guestbook() in /www/110mb.com/d/a/t/a/s/p/o/t/dataspot/htdocs/nellore/modules/spam/spam.module on line 522

spam module files are intact.

problem appeared all of sudden,

i did not touch files/database..