Logstash启动报错

NotImplementedError: block device detection unsupported or native support failed to load
blockdev? at org/jruby/RubyFileTest.java:67
device? at /data/log/logstash-1.5.2/vendor/bundle/jruby/1.9/gems/filewatch-0.6.4/lib/filewatch/helper.rb:67
_sincedb_write at /data/log/logstash-1.5.2/vendor/bundle/jruby/1.9/gems/filewatch-0.6.4/lib/filewatch/tail.rb:233
sincedb_write at /data/log/logstash-1.5.2/vendor/bundle/jruby/1.9/gems/filewatch-0.6.4/lib/filewatch/tail.rb:206
teardown at /data/log/logstash-1.5.2/vendor/bundle/jruby/1.9/gems/logstash-input-file-1.0.0/lib/logstash/inputs/file.rb:152
inputworker at /data/log/logstash-1.5.2/vendor/bundle/jruby/1.9/gems/logstash-core-1.5.2.2-java/lib/logstash/pipeline.rb:202
synchronize at org/jruby/ext/thread/Mutex.java:149
inputworker at /data/log/logstash-1.5.2/vendor/bundle/jruby/1.9/gems/logstash-core-1.5.2.2-java/lib/logstash/pipeline.rb:202
start_input at /data/log/logstash-1.5.2/vendor/bundle/jruby/1.9/gems/logstash-core-1.5.2.2-java/lib/logstash/pipeline.rb:170
linux下配置file插件后，启动报这个错，什么情况啊?