# Logstash 2.3.4 not starting up due to uninitialized constant Gem

**URL:** <https://discuss.elastic.co/t/logstash-2-3-4-not-starting-up-due-to-uninitialized-constant-gem/58191>\
**Category:** Logstash\
**Created:** [August 16, 2016, 9:05pm UTC](https://discuss.elastic.co/t/logstash-2-3-4-not-starting-up-due-to-uninitialized-constant-gem/58191 "2016-08-16T21:05:11Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![biswajit86](https://avatars.discourse-cdn.com/v4/letter/b/f17d59/32.png) [@biswajit86](https://discuss.elastic.co/u/biswajit86)\
**Post date:** [August 16, 2016, 9:05pm UTC](https://discuss.elastic.co/t/logstash-2-3-4-not-starting-up-due-to-uninitialized-constant-gem/58191/1 "2016-08-16T21:05:11Z")

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Hi,

I was trying to upgrade to logstassh 2.3.4 but after installing the tar.gz file from the website, when I try to start logstash , I am geting a `uninitialized constant Gem` error. Can someone please help?

Command  
`bin/logstash -V`

Error  
`NameError: uninitialized constant Gem const_missing at org/jruby/RubyModule.java:2745 patch! at /local/0/deploy/nypntsrv/logstash/logstash-2.3.4/lib/bootstrap/rubygems.rb:19 setup! at /local/0/deploy/nypntsrv/logstash/logstash-2.3.4/lib/bootstrap/bundler.rb:47 (root) at /local/0/deploy/nypntsrv/logstash/logstash-stage-varys/lib/bootstrap/environment.rb:65`

I am trying to run logstash on this environment configuration  
OS: RHEL 5.11  
Gem: 2.4.5  
Ruby: ruby 2.2.2p95

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<div class="post-metadata">

**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [August 18, 2016, 6:50am UTC](https://discuss.elastic.co/t/logstash-2-3-4-not-starting-up-due-to-uninitialized-constant-gem/58191/2 "2016-08-18T06:50:39Z")

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What's your config look like?  
Why not use the rpm?

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 6, 2017, 4:42am UTC](https://discuss.elastic.co/t/logstash-2-3-4-not-starting-up-due-to-uninitialized-constant-gem/58191/3 "2017-07-06T04:42:53Z")

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