Solr HTTP error: OK (404) Error 404 Not Found

HTTP ERROR 404 Not Found

URI:/solr/lon/un_search
STATUS:404
MESSAGE:Not Found
SERVLET:default

Fatal error: Uncaught Error: Unsupported operand types in /var/www/html/query.php:47 Stack trace: #0 /var/www/html/index.php(41): require_once() #1 {main} thrown in /var/www/html/query.php on line 47