/** MySQL database username */ define( 'YOURLS_DB_USER', 'webcomm' ); /** MySQL database password */ define( 'YOURLS_DB_PASS', 'wWwoHy3@h' ); /** The name of the database for YOURLS */ define( 'YOURLS_DB_NAME', 'shorteners' ); /** MySQL hostname */ define( 'YOURLS_DB_HOST', 'thing01.prd.vanderbilt.edu' ); /** MySQL tables prefix */ define( 'YOURLS_DB_PREFIX', 'yourls_' );

Your config.php does not contain all the required constant definitions.

Please check config-sample.php and update your config accordingly, there are new stuffs!