# Logstash-plugin command for preparing offline pack is not working on 8.11.3
**URL:** https://discuss.elastic.co/t/logstash-plugin-command-for-preparing-offline-pack-is-not-working-on-8-11-3/349302
**Category:** Logstash
**Created:** [December 13, 2023, 10:06pm UTC](https://discuss.elastic.co/t/logstash-plugin-command-for-preparing-offline-pack-is-not-working-on-8-11-3/349302 "2023-12-13T22:06:32Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@ebiibe82](https://discuss.elastic.co/u/ebiibe82)
#### Post date: [December 13, 2023, 10:06pm UTC](https://discuss.elastic.co/t/logstash-plugin-command-for-preparing-offline-pack-is-not-working-on-8-11-3/349302/1 "2023-12-13T22:06:33Z")
Hello All,
I am new to Elastic Stack. I have installed Logstash _8.11.3_ using deb package on Ubuntu 22.04 Server. On top of it, I have installed _logstash-output-syslog_ plugin. Till this point, it works fine. After this, I am trying to prepare offline package for this pluing using the following command:
/usr/share/logstash/bin/logstash prepare-offline-pack logstash-output-syslog
On running this command, I am facing the following error:
_Gem::LoadError: You have already activated ffi 1.16.3, but your Gemfile requires ffi 1.15.5....._
Is it a known problem or its a local issue at my end? If it seems to be a local issue, kindly let me know if I am doing anything wrong.
Thanks.
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### Author:  [@sthigpen](https://discuss.elastic.co/u/sthigpen)
#### Post date: [January 2, 2024, 5:56pm UTC](https://discuss.elastic.co/t/logstash-plugin-command-for-preparing-offline-pack-is-not-working-on-8-11-3/349302/2 "2024-01-02T17:56:10Z")
This works as a temporary workaround:
gem install ffi --version='1.15.5' ## needed?
export PATH=/usr/share/logstash/vendor/bundle/jruby/3.1.0/gems/ffi-1.15.5-java/lib/ffi:$PATH ## needed?
use this file from logstash-8.11.2:
/usr/share/logstash/vendor/jruby/lib/ruby/gems/shared/specifications/default/ffi-1.15.4-java.gemspec
and copy into logstash-8.11.3 as:
/usr/share/logstash/vendor/jruby/lib/ruby/gems/shared/specifications/default/ffi-1.15.5-java.gemspec
sed -i 's/1.15.4/1.15.5/g' ffi-1.15.5-java.gemspec
move/rename: /usr/share/logstash/vendor/jruby/lib/ruby/gems/shared/specifications/default/ffi-1.16.3-java.gemspec
systemctl restart logstash # ...etc..
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [January 30, 2024, 5:56pm UTC](https://discuss.elastic.co/t/logstash-plugin-command-for-preparing-offline-pack-is-not-working-on-8-11-3/349302/3 "2024-01-30T17:56:34Z")
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