A Database Error

hi i'm new to codeIgniter.
i'm trying to install codeIgniter on my local host (WAMPP) this site is already hosted on my previous website. i have filled all the details which is needed at least i think and I'm getting this error
//
Unable to connect to your database server using the provided settings.
Filename: C:\wamp\www\site\system\database\DB_driver.php
Line Number: 124
//

i've no idea what i missed please provide a solution
thanks in advance

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