logstash启动报错：IOError: invalid null character in command

老师您好：我们现在用的是logstash-5.2.0，在启动的时候报错： [2017-06-02T15:18:17,351][FATAL][logstash.runner ] An unexpected error occurred! {:error=>#, : backtrace=>["org/jruby/RubyIO.java:4417:in `popen3'", "/data/elk/logstash-5.2.0/vendor/jruby/lib/ruby/1.9/open3.rb:74:in `popen3'", "/data/elk/logstash-5.2.0/logstash-output-exec-master/lib/logstash/outputs/exec.rb:51:in `receive'", "/data/elk/logstash-5.2.0/logstash-core/lib/logstash/outputs/base.rb:92:in `multi_receive'", "org/jruby/RubyArray.java:1613:in `each'", "/data/elk/logstash-5.2.0/logstash-core/lib/logstash/outputs/base.rb:92:in `multi_receive'", "/data/elk/logstash-5.2.0/logstash-core/lib/logstash/output_delegator_strategies/legacy.rb:19:in `multi_receive'", "/data/elk/logstash-5.2.0/logstash-core/lib/logstash/output_delegator.rb:43:in `multi_receive'", "/data/elk/logstash-5.2.0/logstash-core/lib/logstash/pipeline.rb:336:in `output_batch'", "org/jruby/RubyHash.java:1342:in `each'", "/data/elk/logstash-5.2.0/logstash-core/lib/logstash/pipeline.rb:335:in `output_batch'", "/data/elk/logstash-5.2.0/logstash-core/lib/logstash/pipeline.rb:293:in `worker_loop'", "/data/elk/logstash-5.2.0/logstash-core/lib/logstash/pipeline.rb:263:in `start_workers'"]} ，但是我使用命令检查配置文件 语法是正确的，请老师给点意见 谢谢