```php
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/powernet/public_html/api/api/response_afa.php:1) in <b>/home/powernet/public_html/api/api/response_afa.php</b> on line <b>6</b><br />
<br />
<b>Fatal error</b>:  Uncaught Error: Call to undefined function mysqli_connect() in /home/powernet/public_html/database/dbconfig.php:6
Stack trace:
#0 /home/powernet/public_html/api/api/response_afa.php(8): include()
#1 {main}
  thrown in <b>/home/powernet/public_html/database/dbconfig.php</b> on line <b>6</b><br />