[syslog-ng]What does this message mean?

Hi List Folks, Anyone bother to explain to me what this message means? Aug 28 08:44:50 src@hostname syslog-ng[191]: pkt_buffer::do_flush(): Error flushing data OS: Solaris 8 syslog-ng: 1.6.0rc3 Pls let me know if you need more info. Rgds Gary