# 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:** 1
**Showing post:** 7

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### Author: ![yaauie](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/yaauie/32/23363_2.png) [@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")

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> [@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)

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