Sudden Http error 500 on my forum

[mohit587]

My Website is makemetaller dot in    Recently it stopped working. Its giving me http  error 500. I dont know what to do. My hosting is on Php 7.0 . When I opened error log Its giving various error like:

PHP Fatal error:  require_once()
PHP Notice:  Undefined variable: boarddir in /home/s3sbdi3xybhr/public_html/index.php on line 47
PHP Notice:  Undefined variable: sourcedir in /home/s3sbdi3xybhr/public_html/index.php on line 51
PHP Notice:  Undefined variable: sourcedir in /home/s3sbdi3xybhr/public_html/index.php on line 51

Please help me Its urgent.

[Shambles]

Have a look inside your Settings.php file. You may find it's empty. If so, copy up the contents of the Settings_bak.php file.

If that's also empty, recover from a backup (which you ought to have taken) or upload a fresh copy from the installation zip, adjusting the contents to match your url & DB settings.