# How to fix the launcher jar signature invalid error

**URL:** <https://forum.inductiveautomation.com/t/how-to-fix-the-launcher-jar-signature-invalid-error/106563>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [May 22, 2025, 2:17pm UTC](https://forum.inductiveautomation.com/t/how-to-fix-the-launcher-jar-signature-invalid-error/106563 "2025-05-22T14:17:54Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Mahesh\_Madapathi](https://avatars.discourse-cdn.com/v4/letter/m/ce73a5/32.png) [@Mahesh\_Madapathi](https://forum.inductiveautomation.com/u/Mahesh_Madapathi)\
**Post date:** [May 22, 2025, 2:17pm UTC](https://forum.inductiveautomation.com/t/how-to-fix-the-launcher-jar-signature-invalid-error/106563/1 "2025-05-22T14:17:54Z")

</div>

![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/2/c/2c92cbbd53050f118b1c8d3b55187b51dbd64925.png)

Hello,

Can anyone help me why this this occurs, "the launcher client jar signature is invalid"  
How do I fix this?

Thanks,