MyBB Community Forums

When I try access to my forum it shows

Fatal error: Call to undefined function: simple_select() in /home/tutorija/public_html/forum/inc/class_datacache.php on line 42

What's wrong?

Are any mods installed?

Yes, but that isn't problem...  I have been uploading something, and then sudnely something brake... FTP was down, and now when I upload all files again it shows that error...

Sorry for my English

What files did you upload, any core files? Such as inc/config.php?

Reupload db_mysql.php and db_mysqli.php

Also re upload inc/init.php