When i try to enter in the ranks of admin area .. this error appear

what i check in my database ..

I ENEBLED DEBUG MODE AND THIS MESSAGE SHOWED UP :

An error was encountered
File: /www/110mb.com/c/r/i/c/k/e/t/s/cricketstreams/htdocs/Forum/admin_ranks.php
Line: 156

PunBB reported: Unable to fetch rank list

Database reported: Table 'cricketstreams_forum.pbb_ranks' doesn't exist (Errno: 1146)

Moved to Troubleshooting, this isn't a bug in PunBB
It sounds like you dropped the table at some point, you'll need to re-create it.

And using debug mode isn't dangerous per-se, all it does is provide more verbose error messages. The reason it's not enabled all the time is because showing the debug messages to random other people is bad from a security perspective.
Oh, and stop using caps

Run the following query:

CREATE TABLE pbb_ranks (
                    id INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
                    rank VARCHAR(50) NOT NULL DEFAULT '',
                    min_posts MEDIUMINT(8) UNSIGNED NOT NULL DEFAULT 0,
                    PRIMARY KEY (id)
                    ) TYPE=MyISAM;";