scaffolding error

[eluser]raghunath0610[/eluser]
hi every one,

i am trying to use scaffolding so i configured data base and made it as auto load.
and also changed $route['scaffolding_trigger'] in routes.php but iam geting an error

"Fatal error: Call to a member function num_rows() on a non-object in /home/ibridg5/public_html/tasteofandhra/codeigniter/system/database/drivers/mysql/mysql_driver.php on line 334"

pls help in this i am very new to CI ....

thanks,
raghunath.