# Joining failure

**URL:** <https://devforum.zoom.us/t/joining-failure/20728>\
**Category:** Web\
**Created:** [June 9, 2020, 2:47am UTC](https://devforum.zoom.us/t/joining-failure/20728 "2020-06-09T02:47:01Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![tommy](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/tommy/32/72769_2.png) [@tommy](https://devforum.zoom.us/u/tommy)\
**Post date:** [June 12, 2020, 9:01pm UTC](https://devforum.zoom.us/t/joining-failure/20728/2 "2020-06-12T21:01:56Z")

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Hey @ser.shivam1994,

Please make sure you allow some time for the Web SDK files to load:

> [@Uncaught ReferenceError: localJsonpCallback is not defined using zoom web sdk](https://devforum.zoom.us/t/uncaught-referenceerror-localjsonpcallback-is-not-defined-using-zoom-web-sdk/20640/2):
>
> Hey @rahul4, Make sure you allow time for the [Web SDK files](https://marketplace.zoom.us/docs/sdk/native-sdks/web/getting-started/integrate) to load before joining a meeting. ZoomMtg.preLoadWasm(); ZoomMtg.prepareJssdk(); You can check the network tab to see if you are joining the meeting before the Web Assembly files have loaded. Thanks, Tommy

If you are still seeing this issue, please provide steps to reproduce the issue.

Thanks,  
Tommy

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