filatdav on "500 server error after migrating to CentOS 7 --only homepage"

And the debug.log
[19-Jun-2016 11:13:27 UTC] PHP Notice: Undefined index: name in /var/www/html/wp-includes/class-wp-roles.php on lin$
[19-Jun-2016 11:13:27 UTC] PHP Notice: Undefined index: name in /var/www/html/wp-includes/class-wp-roles.php on lin$
[19-Jun-2016 11:13:27 UTC] PHP Notice: Metoda constructor apelată pentru WP_Widget în tp_disqusrecentcomments este $
[19-Jun-2016 11:13:28 UTC] PHP Notice: Undefined offset: 2 in /var/www/html/wp-admin/includes/plugin.php on line 15$
[19-Jun-2016 11:13:28 UTC] PHP Notice: Undefined offset: 2 in /var/www/html/wp-admin/includes/plugin.php on line 15$
[19-Jun-2016 11:13:28 UTC] PHP Notice: Undefined offset: 2 in /var/www/html/wp-admin/includes/plugin.php on line 15$
[19-Jun-2016 11:13:28 UTC] PHP Notice: Undefined offset: 2 in /var/www/html/wp-admin/includes/plugin.php on line 15$
[19-Jun-2016 11:13:28 UTC] PHP Notice: Undefined offset: 2 in /var/www/html/wp-admin/includes/plugin.php on line 15$
[19-Jun-2016 11:13:28 UTC] PHP Notice: Undefined offset: 2 in /var/www/html/wp-admin/includes/plugin.php on line 15$
[19-Jun-2016 11:13:28 UTC] PHP Notice: Undefined offset: 2 in /var/www/html/wp-admin/includes/plugin.php on line 15$
[19-Jun-2016 11:13:28 UTC] PHP Notice: Undefined offset: 2 in /var/www/html/wp-admin/includes/plugin.php on line 15$
[19-Jun-2016 11:13:28 UTC] PHP Notice: Undefined offset: 2 in /var/www/html/wp-admin/includes/plugin.php on line 15$
[19-Jun-2016 11:13:28 UTC] PHP Notice: Undefined offset: 2 in /var/www/html/wp-admin/includes/plugin.php on line 15$
[19-Jun-2016 11:13:28 UTC] PHP Notice: Undefined offset: 2 in /var/www/html/wp-admin/includes/plugin.php on line 15$
[19-Jun-2016 11:13:28 UTC] PHP Notice: Undefined offset: 2 in /var/www/html/wp-admin/includes/plugin.php on line 15$
[19-Jun-2016 11:13:28 UTC] PHP Notice: Undefined offset: 2 in /var/www/html/wp-admin/includes/plugin.php on line 15$
[19-Jun-2016 11:13:28 UTC] PHP Notice: Undefined offset: 2 in /var/www/html/wp-admin/includes/plugin.php on line 15$
[19-Jun-2016 11:13:28 UTC] PHP Notice: Undefined offset: 2 in /var/www/html/wp-admin/includes/plugin.php on line 15$
[19-Jun-2016 11:13:28 UTC] PHP Notice: Undefined offset: 2 in /var/www/html/wp-admin/includes/plugin.php on line 15$
[19-Jun-2016 11:13:28 UTC] PHP Notice: Undefined offset: 2 in /var/www/html/wp-admin/includes/plugin.php on line 15$
[19-Jun-2016 11:13:28 UTC] PHP Notice: Undefined offset: 2 in /var/www/html/wp-admin/includes/plugin.php on line 15$