# IOS SDK start Meeing problem

**URL:** <https://devforum.zoom.us/t/ios-sdk-start-meeing-problem/625>\
**Category:** iOS\
**Tags:** ecq\
**Created:** [June 21, 2017, 7:33am UTC](https://devforum.zoom.us/t/ios-sdk-start-meeing-problem/625 "2017-06-21T07:33:48Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![lujianglei](https://avatars.discourse-cdn.com/v4/letter/l/9fc348/32.png) [@lujianglei](https://devforum.zoom.us/u/lujianglei)\
**Post date:** [June 21, 2017, 7:33am UTC](https://devforum.zoom.us/t/ios-sdk-start-meeing-problem/625/1 "2017-06-21T07:33:48Z")

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![](https://support.zoom.us/hc/user_images/GtVFlCo6Dq7nZzctKV2qHA.png)

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**Author:** ![lujianglei](https://avatars.discourse-cdn.com/v4/letter/l/9fc348/32.png) [@lujianglei](https://devforum.zoom.us/u/lujianglei)\
**Post date:** [June 21, 2017, 7:34am UTC](https://devforum.zoom.us/t/ios-sdk-start-meeing-problem/625/2 "2017-06-21T07:34:55Z")

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What is error code 16 means ? it doesn’t defined on list.

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**Author:** ![Zoom\_Demo](https://avatars.discourse-cdn.com/v4/letter/z/50afbb/32.png) [@Zoom\_Demo](https://devforum.zoom.us/u/Zoom_Demo)\
**Post date:** [June 22, 2017, 1:11am UTC](https://devforum.zoom.us/t/ios-sdk-start-meeing-problem/625/3 "2017-06-22T01:11:48Z")

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Hi Lujianglei,

Error code 16 means:&nbsp;ZoomSDKMeetingError\_StartTokenExpired.&nbsp;Web rejected the identity token send from client. It could caused by dirty data in local DB. In most case, delete the data folder(documentation) and restart zoom will fix this issue.

We will define more error codes on the next release, thanks for your request!

Best