# OH3 UI wont start after cleaning cache

**URL:** <https://community.openhab.org/t/oh3-ui-wont-start-after-cleaning-cache/121457>\
**Category:** Runtime\
**Tags:** cache\
**Created:** [April 27, 2021, 8:43am UTC](https://community.openhab.org/t/oh3-ui-wont-start-after-cleaning-cache/121457 "2021-04-27T08:43:33Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![MartOs](https://community.openhab.org/user_avatar/community.openhab.org/martos/32/64748_2.png) [@MartOs](https://community.openhab.org/u/MartOs)\
**Post date:** [April 27, 2021, 8:43am UTC](https://community.openhab.org/t/oh3-ui-wont-start-after-cleaning-cache/121457/1 "2021-04-27T08:43:34Z")

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I was trobleshooting a problem described in this post

> [@Openhab iOS app, iOS Shortcuts, iOS Home app - How to?](https://community.openhab.org/t/openhab-ios-app-ios-shortcuts-ios-home-app-how-to/120796/39):
>
> I used this [Clean cache](https://community.openhab.org/t/how-to-publish-items-to-mqtt-using-mqtt-binding/91831/7)

But after cleaning the cache, openhab UI will not start.  
I’ve rebooted about 4 times now.  
My other software, Plex, PiHole etc are running fine.

No automations are running and switches and bulbs etc aren’t triggering anything.

Can’t log into openhab-cli console. I get the error ‘Failed to get the session.’

`openhab-cli status` shows `openHAB is running with PID: 906 and has been running for 03:57`

OpenHAB version 3.1.0.M3

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**Author:** ![rossko57](https://community.openhab.org/user_avatar/community.openhab.org/rossko57/32/70263_2.png) [@rossko57](https://community.openhab.org/u/rossko57)\
**Post date:** [April 27, 2021, 9:29am UTC](https://community.openhab.org/t/oh3-ui-wont-start-after-cleaning-cache/121457/2 "2021-04-27T09:29:28Z")

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Sounds like -

> [@Unable to start OH -- please help me](https://community.openhab.org/t/unable-to-start-oh-please-help-me/121435):
>
> Platform information: Intel i5 Windows 10 Java Runtime Environment: which java platform is used and what version openHAB 2.5.11 Issue of the topic: Unable to start openhab. After I cleared the cache and tmp folders in an attempt to resolve connection issue with the openhab cloud, I became unable to start my openhab server. I keep getting error messages about the startup script being unable to reach some network resources, even though my machine is online. See attached log. I have no idea wh…

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**Author:** ![MartOs](https://community.openhab.org/user_avatar/community.openhab.org/martos/32/64748_2.png) [@MartOs](https://community.openhab.org/u/MartOs)\
**Post date:** [April 27, 2021, 9:41am UTC](https://community.openhab.org/t/oh3-ui-wont-start-after-cleaning-cache/121457/3 "2021-04-27T09:41:43Z")

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Not sure.

I just downgraded to stable release, then back to Milestone release and everything seems back to normal.