# "Launch client jar signature is invalid" error

**URL:** <https://forum.inductiveautomation.com/t/launch-client-jar-signature-is-invalid-error/111292>\
**Category:** Ignition\
**Tags:** vision\
**Created:** [October 8, 2025, 5:58pm UTC](https://forum.inductiveautomation.com/t/launch-client-jar-signature-is-invalid-error/111292 "2025-10-08T17:58:34Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Jacob\_Dipietro](https://avatars.discourse-cdn.com/v4/letter/j/82dd89/32.png) [@Jacob\_Dipietro](https://forum.inductiveautomation.com/u/Jacob_Dipietro)\
**Post date:** [October 8, 2025, 6:06pm UTC](https://forum.inductiveautomation.com/t/launch-client-jar-signature-is-invalid-error/111292/2 "2025-10-08T18:06:47Z")

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Hey I might be completly off with this, but it looks like you have a similar issue to something mentioned on this post. Not sure of the details, but has the same error you have, so it might work.

[Unable to start Designer or Client ERROR "This Launch Jar Signature is invalid. Contact an administrator" - #15 by jcoffman](https://forum.inductiveautomation.com/t/unable-to-start-designer-or-client-error-this-launch-jar-signature-is-invalid-contact-an-administrator/96092/15)

They also mentioned this: [Launchers and Workstation | Ignition User Manual](https://docs.inductiveautomation.com/docs/8.3/launchers-and-workstation#signature-verification)

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