# Error startup vision client during connection with backup gateway

**URL:** <https://forum.inductiveautomation.com/t/error-startup-vision-client-during-connection-with-backup-gateway/46566>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [May 11, 2021, 9:01am UTC](https://forum.inductiveautomation.com/t/error-startup-vision-client-during-connection-with-backup-gateway/46566 "2021-05-11T09:01:55Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [May 11, 2021, 9:56am UTC](https://forum.inductiveautomation.com/t/error-startup-vision-client-during-connection-with-backup-gateway/46566/2 "2021-05-11T09:56:44Z")

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You must ensure all of your add-on module versions are identical on both gateways. If you update/add a module on the master while they are synchronized, it will be added/updated on the backup server for you. If you add/update modules at any other time, you must manage the versions yourself.

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