[syslog-ng] mongodb not found in /etc/syslog-ng/syslog-ng.conf at line 30, column 23:

Hi, Can you tell what I'm doing wrong here? I entered destination mongodb { mongodb(); }; log { source(src); destination(mongodb); }; in syslogng.conf as in the directions and this is what happens: user@syslog:~/syslogng-web$ sudo service syslog-ng restart * Stopping system logging syslog-ng [ OK ] * Starting system logging syslog-ng Error parsing destination, destination plugin mongodb not found in /etc/syslog-ng/syslog-ng.conf at line 30, column 23: destination mongodb { mongodb() ; }; ^^^^^^^