How do I fix this fatal error?

[CouponWCents]

Fatal error: Class 'ExtendedSessions' not found in /home/content/54/7891054/html/includes/init.php(336) : eval()'d code on line 843

I can't get into anything!

[Lynne]

That error is from a modification. Try disabling your modifications/plugins and see if you still have this problem.
Note: To temporarily disable the plugin system, edit includes/config.php and add this line right under <?php

define('DISABLE_HOOKS', true);

[CouponWCents]

I have nothing in includes/config.php

I want to cry

[Lynne]

You'd better have something in includes/config.php or your forum would not work. It should have all the information vbulletin needs to access your database in there.

[CouponWCents]

The forum doesn't work, nothign

[kh99]

You need to download your includes/config.php using ftp, then edit it as Lynne described above, then upload it again and overwrite the existing file.