logtash GELF message

gistfile1.txt

{:timestamp=>"2013-08-26T12:50:06.811000-0500", :message=>"Trouble sending GELF event", :gelf_event=>{"short_message"=>nil, "full_message"=>"%{@message}", "host"=>"moslexglog-devel", "file"=>"%{@source_path}", "_events.count"=>4981, "_events.rate_1m"=>194.2989022840943, "_events.rate_5m"=>199.33349711756875, "_events.rate_15m"=>199.5631028812791, "_tags"=>"metric", "facility"=>"%{syslog_facility}"}, :event=>#<LogStash::Event:0xeda3936 @cancelled=false, @data={"@source"=>"unknown", "@tags"=>["metric"], "@fields"=>{"events.count"=>4981, "events.rate_1m"=>194.2989022840943, "events.rate_5m"=>199.33349711756875, "events.rate_15m"=>199.5631028812791}, "@timestamp"=>"2013-08-26T17:50:06.809Z", "@source_host"=>"loghost"}>, :error=>#<ArgumentError: short_message is missing. Options version, short_message and host must be set.>, :level=>:warn}