# Kibana 6.1.0. and newer starts with error

**URL:** <https://discuss.elastic.co/t/kibana-6-1-0-and-newer-starts-with-error/111754>\
**Category:** Kibana\
**Created:** [December 14, 2017, 11:21am UTC](https://discuss.elastic.co/t/kibana-6-1-0-and-newer-starts-with-error/111754 "2017-12-14T11:21:41Z")\
**Posts on this page:** 1\
**Showing post:** 56

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**Author:** ![Kris\_Y](https://avatars.discourse-cdn.com/v4/letter/k/a587f6/32.png) [@Kris\_Y](https://discuss.elastic.co/u/Kris_Y)\
**Post date:** [January 22, 2018, 10:13pm UTC](https://discuss.elastic.co/t/kibana-6-1-0-and-newer-starts-with-error/111754/56 "2018-01-22T22:13:29Z")

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I am also having this problem. I installed Version: 6.1.2  
Build: 16363 on Windows 10. I tried removing the "optimization" folder but still receive the same error below. I checked folder permissions as well. Any assistance would be greatly appreciated.

Error: TypeError: \_reactcss.handleHover is not a function ([http://localhost:5601/bundles/kibana.bundle.js?v=16363:67](http://localhost:5601/bundles/kibana.bundle.js?v=16363:67))  
[2132]/window.onerror@[http://localhost:5601/bundles/commons.bundle.js?v=16363:45:8728](http://localhost:5601/bundles/commons.bundle.js?v=16363:45:8728)

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