Unable to connect to your database server [Closed]

Registration date
Thursday January 22, 2015
Last seen
December 1, 2016
Hi there

am trying to connect my website with the rights credentials and am receiving an error that saying :

Unable to connect to your database server using the provided settings.

Filename: core/Loader.php

Line Number: 346

i have uploaded . the full page of the loader to see if someone who can assist me to know why this error is happening. thanks in advance for your assistance.
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