# Kibana 6.1.1 Fatal Error at start

**URL:** <https://discuss.elastic.co/t/kibana-6-1-1-fatal-error-at-start/112986>\
**Category:** Kibana\
**Created:** [December 22, 2017, 11:01am UTC](https://discuss.elastic.co/t/kibana-6-1-1-fatal-error-at-start/112986 "2017-12-22T11:01:26Z")\
**Posts on this page:** 1\
**Showing post:** 2

<div class="post-metadata">

**Author:** ![Mojster](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mojster/32/21209_2.png) [@Mojster](https://discuss.elastic.co/u/Mojster)\
**Post date:** [December 22, 2017, 12:41pm UTC](https://discuss.elastic.co/t/kibana-6-1-1-fatal-error-at-start/112986/2 "2017-12-22T12:41:58Z")

</div>

I've got similar issue with 6.1.0 & 6.1.1, but mine's with `react` and not `prototype`.  
You can read here: [Kibana 6.1.0. starts with error](https://discuss.elastic.co/t/kibana-6-1-0-starts-with-error/111754)

Try deleting optimeze folder. It did help in one case.

---

_[View the full topic](https://discuss.elastic.co/t/kibana-6-1-1-fatal-error-at-start/112986)._