syslog-ng local4debug issue

Dear All,

I am facing the issue, i am trying local4debug with the following configuration changes in /etc/syslog-ng/syslog-ng.conf

filter f_local4info { level(info) and facility(local4); };
destination local4info { file("/var/log/local4.info"); };
log { source(src); filter(f_local4info); destination(local4info); };

But i am unable to get the logs created.