# Vision Client Launcher error message

**URL:** <https://forum.inductiveautomation.com/t/vision-client-launcher-error-message/80594>\
**Category:** Ignition\
**Tags:** vision\
**Created:** [October 17, 2023, 12:50pm UTC](https://forum.inductiveautomation.com/t/vision-client-launcher-error-message/80594 "2023-10-17T12:50:41Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![tmcauley](https://avatars.discourse-cdn.com/v4/letter/t/7feea3/32.png) [@tmcauley](https://forum.inductiveautomation.com/u/tmcauley)\
**Post date:** [October 17, 2023, 12:50pm UTC](https://forum.inductiveautomation.com/t/vision-client-launcher-error-message/80594/1 "2023-10-17T12:50:41Z")

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Hi,

I am getting the following error when trying to launch an application from the Vision Client Launcher. Is there a fix for this?  
Have tried deleting the cache folder but it still won't launch.

“Error launching application:RuntimeException: The client version or cached module versions are not compatible with the gateway version. Please re-launchclient.”

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<div class="post-metadata">

**Author:** ![Tyler\_Shoemake](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/tyler_shoemake/32/55661_2.png) [@Tyler\_Shoemake](https://forum.inductiveautomation.com/u/Tyler_Shoemake)\
**Post date:** [October 17, 2023, 4:42pm UTC](https://forum.inductiveautomation.com/t/vision-client-launcher-error-message/80594/2 "2023-10-17T16:42:09Z")

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This looks like its the same error as yours, try this.

> [@Error startup vision client during connection with backup gateway](https://forum.inductiveautomation.com/t/error-startup-vision-client-during-connection-with-backup-gateway/46566/2):
>
> 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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<div class="post-metadata">

**Author:** ![tmcauley](https://avatars.discourse-cdn.com/v4/letter/t/7feea3/32.png) [@tmcauley](https://forum.inductiveautomation.com/u/tmcauley)\
**Post date:** [October 18, 2023, 11:10am UTC](https://forum.inductiveautomation.com/t/vision-client-launcher-error-message/80594/3 "2023-10-18T11:10:45Z")

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My system isn't using redundancy.  
I seem to have fixed it with a stop and start of the gateway.