# Unable to install logstash-core gem
**URL:** https://discuss.elastic.co/t/unable-to-install-logstash-core-gem/126619
**Category:** Logstash
**Created:** [April 3, 2018, 6:21pm UTC](https://discuss.elastic.co/t/unable-to-install-logstash-core-gem/126619 "2018-04-03T18:21:25Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@annk](https://discuss.elastic.co/u/annk)
#### Post date: [April 3, 2018, 6:21pm UTC](https://discuss.elastic.co/t/unable-to-install-logstash-core-gem/126619/1 "2018-04-03T18:21:26Z")
Hi ,
I am trying to install xpack on logstash server , but it complained about missing logstash-core gem.
Tried to install logstash-core-6.2.2 after installing all dependencies .
$ gem list
\*\*\* LOCAL GEMS \*\*\*
jar-dependencies (0.3.12)
json (1.8.3)
manticore (0.5.4 java)
minitest (5.8.3)
rake (10.4.2)
rdoc (4.2.1)
ruby-maven (3.3.12)
ruby-maven-libs (3.3.9)
test-unit (3.1.5)
$gem install --no-user-install ./logstash-core-6.2.2-java.gem
ERROR: Could not find a valid gem 'manticore' (\< 1.0.0, \>= 0.5.4) in any repository
Thanks
---
### Author:  [@yaauie](https://discuss.elastic.co/u/yaauie)
#### Post date: [April 3, 2018, 6:39pm UTC](https://discuss.elastic.co/t/unable-to-install-logstash-core-gem/126619/2 "2018-04-03T18:39:26Z")
While Logstash uses the rubygems ecosystem for dependencies and plugins, it can't be installed in the normal way you would install a gem; you'll need to either [download a Logstash distribution from elastic.co](https://www.elastic.co/downloads/logstash), or [build an artifact from source](https://github.com/elastic/logstash#building-artifacts).
---
### Author:  [@annk](https://discuss.elastic.co/u/annk)
#### Post date: [April 4, 2018, 9:20am UTC](https://discuss.elastic.co/t/unable-to-install-logstash-core-gem/126619/4 "2018-04-04T09:20:54Z")
I do have the latest logstash installed and running.
I am trying to follow this documentation [https://www.elastic.co/guide/en/logstash/6.2/installing-xpack-log.html](https://www.elastic.co/guide/en/logstash/6.2/installing-xpack-log.html)
./logstash-plugin install file:///apps/x-pack-6.2.2.zip
Installing file: /apps/x-pack-6.2.2.zip
ERROR: An error occured when installing the: file:///apps/x-pack-6.2.2.zip, to have more information about the error add a DEBUG=1 before running the command., message: Bundler could not find compatible versions for gem "logstash-core":
In snapshot (Gemfile.lock):
logstash-core (= 6.2.3)
In Gemfile:
logstash-core-plugin-api (\>= 0) java depends on
logstash-core (= 6.2.3) java
logstash-input-syslog (\>= 0) java depends on
logstash-filter-grok (\>= 0) java depends on
logstash-core (\>= 5.6.0) java
x-pack (= 6.2.2) java depends on
logstash-core (= 6.2.2) java
logstash-core (\>= 0) java
Running bundle update will rebuild your snapshot from scratch, using only
the gems in your Gemfile, which may resolve the conflict.
---
### Author:  [@yaauie](https://discuss.elastic.co/u/yaauie)
#### Post date: [April 4, 2018, 6:40pm UTC](https://discuss.elastic.co/t/unable-to-install-logstash-core-gem/126619/5 "2018-04-04T18:40:22Z")
It looks like you're attempting to install x-pack version 6.2.2 with Logstash version 6.2.3, but we need for them to have identical versions.
Is the system you're working on offline?
If it can be connected to the internet, using the default pack installer path will always get the right version-match:
```auto
bin/logstash-plugin install x-pack
```
---
### Author:  [@annk](https://discuss.elastic.co/u/annk)
#### Post date: [April 5, 2018, 2:40pm UTC](https://discuss.elastic.co/t/unable-to-install-logstash-core-gem/126619/6 "2018-04-05T14:40:20Z")
thanks . I managed to install the correct version but I did get this (error?)
./logstash-plugin install file:///root/canvas/x-pack-6.2.3.zip
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Invalid date/time in zip entry
Install successful
---
### Author:  [@yaauie](https://discuss.elastic.co/u/yaauie)
#### Post date: [April 5, 2018, 5:43pm UTC](https://discuss.elastic.co/t/unable-to-install-logstash-core-gem/126619/7 "2018-04-05T17:43:28Z")
> [@annk](#):
>
> Invalid date/time in zip entry
This is annoying, but harmless; the Ruby zip implementation that we use to unzip the archive outputs this message directly to stdout whenever it encounters an invalid date, and the global x-pack build for 6.2.3 included a few components without their dates set.
[https://github.com/elastic/x-pack-logstash/issues/348](https://github.com/elastic/x-pack-logstash/issues/348)
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [May 3, 2018, 5:43pm UTC](https://discuss.elastic.co/t/unable-to-install-logstash-core-gem/126619/8 "2018-05-03T17:43:36Z")
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