Logstash 6.2.3 constantly restarting

[souf_el_badraoui]

Hi,
I used Centos 7 with elk stack 6.2.3. After installing x-pack, logstash contantly restarting (systemd). the logs show
[FATAL][logstash.runner ] An unexpected error occurred! {:error=>#<ArgumentError: could not coerce automatic into a boolean>, :backtrace=>["/usr/share/logstash/logstash-core/lib/logstash/settings.rb:290:in coerce'", "/usr/share/logstash/logstash-core/lib/logstash/settings.rb:265:inset'", "/usr/share/logstash/logstash-core/lib/logstash/settings.rb:70:in set_value'", "/usr/share/logstash/logstash-core/lib/logstash/settings.rb:89:inblock in merge'", "org/jruby/RubyHash.java:1343:in each'", "/usr/share/logstash/logstash-core/lib/logstash/settings.rb:89:inmerge'", "/usr/share/logstash/logstash-core/lib/logstash/settings.rb:138:in validate_all'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:264:inexecute'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/clamp-0.6.5/lib/clamp/command.rb:67:in run'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:219:inrun'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/clamp-0.6.5/lib/clamp/command.rb:132:in run'", "/usr/share/logstash/lib/bootstrap/environment.rb:67:in'"]}
[2018-04-10T13:15:38,422][ERROR][org.logstash.Logstash ] java.lang.IllegalStateException: org.jruby.exceptions.RaiseException: (SystemExit) exit
Can you help me !