# An unexpected error occurred! {:error=\>#\<ArgumentError: Setting "localhostck.monitoring.elasticsearch.username" hasn't been registered\>,

**URL:** <https://discuss.elastic.co/t/an-unexpected-error-occurred-error-argumenterror-setting-localhostck-monitoring-elasticsearch-username-hasnt-been-registered/115232>\
**Category:** Logstash\
**Created:** [January 12, 2018, 7:32am UTC](https://discuss.elastic.co/t/an-unexpected-error-occurred-error-argumenterror-setting-localhostck-monitoring-elasticsearch-username-hasnt-been-registered/115232 "2018-01-12T07:32:18Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![shaonbean](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/shaonbean/32/14416_2.png) [@shaonbean](https://discuss.elastic.co/u/shaonbean)\
**Post date:** [January 12, 2018, 7:32am UTC](https://discuss.elastic.co/t/an-unexpected-error-occurred-error-argumenterror-setting-localhostck-monitoring-elasticsearch-username-hasnt-been-registered/115232/1 "2018-01-12T07:32:19Z")

</div>

env: elastic stack 6.1.1 centos6.9

when install x-pack,start logstash erros

[2018-01-12T15:31:58,463][INFO][logstash.modules.scaffold] Initializing module {:module\_name=\>"netflow", :directory=\>"/usr/share/logstash/modules/netflow/configuration"}  
[2018-01-12T15:31:58,466][INFO][logstash.modules.scaffold] Initializing module {:module\_name=\>"fb\_apache", :directory=\>"/usr/share/logstash/modules/fb\_apache/configuration"}  
[2018-01-12T15:31:58,649][INFO][logstash.modules.scaffold] Initializing module {:module\_name=\>"arcsight", :directory=\>"/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/x-pack-6.1.1-java/modules/arcsight/configuration"}  
[2018-01-12T15:31:58,666][FATAL][logstash.runner] An unexpected error occurred! {:error=\>#\<ArgumentError: Setting "localhostck.monitoring.elasticsearch.username" hasn't been registered\>, :backtrace=\>["/usr/share/logstash/logstash-core/lib/logstash/settings.rb:32:in `get_setting'", "/usr/share/logstash/logstash-core/lib/logstash/settings.rb:65:in`set\_value'", "/usr/share/logstash/logstash-core/lib/logstash/settings.rb:84:in `block in merge'", "org/jruby/RubyHash.java:1343:in`each'", "/usr/share/logstash/logstash-core/lib/logstash/settings.rb:84:in `merge'", "/usr/share/logstash/logstash-core/lib/logstash/settings.rb:133:in`validate\_all'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:259:in `execute'", "/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:214:in `run'", "/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 `'"]}

---

<div class="post-metadata">

**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [January 16, 2018, 4:31pm UTC](https://discuss.elastic.co/t/an-unexpected-error-occurred-error-argumenterror-setting-localhostck-monitoring-elasticsearch-username-hasnt-been-registered/115232/2 "2018-01-16T16:31:46Z")

</div>

It looks like you have a typo in your configuration file. Find the file containing "localhostck" and post the surrounding lines. Format as preformatted text with the `</>` toolbar button.

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [February 13, 2018, 4:31pm UTC](https://discuss.elastic.co/t/an-unexpected-error-occurred-error-argumenterror-setting-localhostck-monitoring-elasticsearch-username-hasnt-been-registered/115232/3 "2018-02-13T16:31:47Z")

</div>

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.