Thread:Extension talk:ContactPage/No such special page

I added the extension /extensions/ContactPage/ContactPage.php"

then included the $IP/extensions/ContactPage/ContactPage.php" on the Localhost.php

i checked in Special:Version and found that it was installed: ContactPage (Version 2.2)(1671850)	Contact form for visitors

but when i navigate to Special:Contact i get No such special page You have requested an invalid special page. A list of valid special pages can be found at Special pages. Return to Main Page.

anyone has any ideas?