# Vision Client Project not opening after "Verifying Signature of Vision Client"

**URL:** <https://forum.inductiveautomation.com/t/vision-client-project-not-opening-after-verifying-signature-of-vision-client/114678>\
**Category:** Ignition\
**Tags:** troubleshooting, vision\
**Created:** [March 25, 2026, 8:00pm UTC](https://forum.inductiveautomation.com/t/vision-client-project-not-opening-after-verifying-signature-of-vision-client/114678 "2026-03-25T20:00:55Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\
**Post date:** [March 25, 2026, 9:16pm UTC](https://forum.inductiveautomation.com/t/vision-client-project-not-opening-after-verifying-signature-of-vision-client/114678/6 "2026-03-25T21:16:54Z")

</div>

> Error: Could not find or load main class com.inductiveautomation.ignition.client.launch.BootstrapSwing  
> Caused by: java.lang.ClassNotFoundException: com.inductiveautomation.ignition.client.launch.BootstrapSwing

This error means that the `launchclient.jar` file is somehow corrupted/invalid. Basically the _only_ thing it contains is the `BootstrapSwing` class. Deleting it should force it to be downloaded fresh from the gateway, which hopefully would have fixed it.

If you look at the file on disk, does it show any obvious discrepancies (e.g. a filesize of 0kB) or anything like that? You can also try opening the .jar file as a zip and taking a look at what it contains.

Does your IT group have any security scanning software that might be interfering?

At the point things are failing, the launcher isn't involved any more - the launcher is involved up until the "Starting Java with the following parameters" line you get in the logs, which is where I got the snippet I had you run manually. At that point, the "bootstrap" process uses a launch client jar _from the target gateway_ to kick off a new Java process running the 'full' Vision/Designer application.

You may need to take this to support to get more complete troubleshooting done with your 'live' system.

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