error log

[error] 5541#0: *6 FastCGI sent in stderr:
            "Unable to open primary script: /usr/share/nginx/html/index.php (No such file or directory)"
            while reading response header from upstream, client: ::1, server: localhost,
            request: "GET /public_html/owncloud/index.php/apps/files/ HTTP/1.1",
            upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "localhost",
            referrer: "http://localhost/public_html/owncloud/index.php"