# Unsupported time zone specified undefined **URL:** \ **Category:** Troubleshooting\ **Created:** [May 12, 2017, 7:35pm UTC](https://forum.mattermost.com/t/unsupported-time-zone-specified-undefined/3252 "2017-05-12T19:35:15Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![danilvoe](https://avatars.discourse-cdn.com/v4/letter/d/9d8465/32.png) [@danilvoe](https://forum.mattermost.com/u/danilvoe)\ **Post date:** [May 12, 2017, 7:35pm UTC](https://forum.mattermost.com/t/unsupported-time-zone-specified-undefined/3252/1 "2017-05-12T19:35:15Z")
In the server logs an error is fixed (the second day of using the chat) > [2017/05/12 18:55:09 MSK] [EROR] /api/v3/general/log\_client:client code=0 rid=83z5cgm6wpf3jez9azjmbftade uid=3cd9q5tpui818xnkfh4xwhtrhc ip=10.1.143.207 msg: Uncaught RangeError: Unsupported time zone specified undefined row: 103 col: 22 stack: RangeError: Unsupported time zone specified undefined url: [http://im.kadastr.ru/support-portal/channels/town-square](http://im.kadastr.ru/support-portal/channels/town-square) [details:] what could be the problem? ---
**Author:** ![danilvoe](https://avatars.discourse-cdn.com/v4/letter/d/9d8465/32.png) [@danilvoe](https://forum.mattermost.com/u/danilvoe)\ **Post date:** [May 16, 2017, 7:11am UTC](https://forum.mattermost.com/t/unsupported-time-zone-specified-undefined/3252/2 "2017-05-16T07:11:11Z")
The error becomes mass 😞 ---
**Author:** ![lindy65](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mattermost.com/lindy65/32/1811_2.png) [@lindy65](https://forum.mattermost.com/u/lindy65)\ **Post date:** [May 18, 2017, 9:13am UTC](https://forum.mattermost.com/t/unsupported-time-zone-specified-undefined/3252/3 "2017-05-18T09:13:48Z")
Hi @danilvoe, Can this user try [clearing his cache](https://kb.iu.edu/d/ahic) and re-logging to Mattermost? If they’re on mobile, can the user try re-installing the app?