# Fatal error on Kibana startup - 8.19.5 - Windows Server 2025 - Error: Cannot find module '../series\_functions/undefined'

**URL:** <https://discuss.elastic.co/t/fatal-error-on-kibana-startup-8-19-5-windows-server-2025-error-cannot-find-module-series-functions-undefined/382920>\
**Category:** Kibana\
**Created:** [October 23, 2025, 1:20pm UTC](https://discuss.elastic.co/t/fatal-error-on-kibana-startup-8-19-5-windows-server-2025-error-cannot-find-module-series-functions-undefined/382920 "2025-10-23T13:20:43Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Rios](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rios/32/95745_2.png) [@Rios](https://discuss.elastic.co/u/Rios)\
**Post date:** [October 23, 2025, 1:59pm UTC](https://discuss.elastic.co/t/fatal-error-on-kibana-startup-8-19-5-windows-server-2025-error-cannot-find-module-series-functions-undefined/382920/2 "2025-10-23T13:59:22Z")

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An issue has already been mentioned [here](https://discuss.elastic.co/t/kibana-9-1-4-on-windows-fails-to-start-due-to-timelion-plugin-cannot-find-module-series-functions-undefined/382144)

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_[View the full topic](https://discuss.elastic.co/t/fatal-error-on-kibana-startup-8-19-5-windows-server-2025-error-cannot-find-module-series-functions-undefined/382920)._