至急お願いします！500エラーになってしまいました

function.phpを弄っていたところ、誤って変に変えてしまい、500エラーになってしまいました。
デバッグモードにしたところ、
Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/erovideomatome.com/httpdocs/wp-content/plugins/exec-php/exec-php.php on line 22 Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/erovideomatome.com/httpdocs/wp-content/plugins/exec-php/includes/manager.php on line 36 Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/erovideomatome.com/httpdocs/wp-content/plugins/exec-php/includes/manager.php on line 37 Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/erovideomatome.com/httpdocs/wp-content/plugins/exec-php/includes/manager.php on line 38 Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/erovideomatome.com/httpdocs/wp-content/plugins/exec-php/includes/manager.php on line 39 Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/erovideomatome.com/httpdocs/wp-content/plugins/exec-php/includes/admin.php on line 53 Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/erovideomatome.com/httpdocs/wp-content/plugins/exec-php/includes/admin.php on line 56 Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/erovideomatome.com/httpdocs/wp-content/plugins/exec-php/includes/admin.php on line 57 Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/erovideomatome.com/httpdocs/wp-content/plugins/exec-php/includes/admin.php on line 63 Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/erovideomatome.com/httpdocs/wp-content/plugins/exec-php/includes/admin.php on line 64 Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/erovideomatome.com/httpdocs/wp-content/plugins/exec-php/includes/admin.php on line 79 Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/erovideomatome.com/httpdocs/wp-content/plugins/exec-php/includes/cache.php on line 22 Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/erovideomatome.com/httpdocs/wp-content/plugins/exec-php/includes/cache.php on line 39 Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/erovideomatome.com/httpdocs/wp-content/plugins/exec-php/includes/ajax.php on line 64 Parse error: syntax error, unexpected ‘.’ in /var/www/vhosts/erovideomatome.com/httpdocs/wp-content/themes/responsive_031/functions.php on line 78

とブラウザ上で表示されます。

どうすれば良いでしょうか？

宜しくお願い致します。