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Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /home/rwandmdc/public_html/ecrire/req/mysql.php on line 493

Hi all, i would like to know how to solve this problem,
after hosting my website, when i try to access the URL, it shows me the error saying:

Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /home/rwandmdc/public_html/ecrire/req/mysql.php on line 493

and display:

Erreur...
Fichier composer introuvable

Thank so much you for answer!