Database Query error!

Please can anyone help me solve this problem. My website was working well until a few hours ago when it start give this error on my  site. Keeps showing this "Database Query error". Anyone know what this problem is and how to sort it out? Please immediate assistance needed.

This could be one of many MANY many things. It really depends what you were doing before the error occurred. Check your error.log file in the site's root to see what's occurring. If you can't remember what you were doing, then try to look at the date of the files in FTP and replace them with the original files (backing up first). Or, if that fails, restore a back-up - or if the site's new and relatively unchanged... start again.

I did absolutely nothing. And there is nothing on error log to suggest anything. the last error record was for 28th april. This beats me.

We already have lots fo unique contents and some members. Could be one of the free addons or anything.

So if you have no idea what it could be, how do you expect people with no access to your site or any of the admin controls to suggest a solution to an entirely generic error message?

The information you've provided is useless. You need to enable database debugging and post the full output. You can enable database debugging by editing inc/classes/BxDolDb.php and changing:

define( 'DB_FULL_DEBUG_MODE', false );

to:

define( 'DB_FULL_DEBUG_MODE', true );