ClassNotFoundException launching Designer

Dear Kurt

Many thanks for your efforts i just deleted “designer-launcher.json” and everything became ok.
but before deleting the file i found “main.class”: “com.inductiveautomation.ignition.designer.DesignerStartupHook” as you mentioned not “null”.

Best Regards
Nouh

Many thanks for your efforts i just deleted “designer-launcher.json” and everything became ok.

Best Regards
Nouh

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Hi, I am also having this problem and have tried your solution which works fine. The problem is that it appears again now and then. Another of my colleges have the same problem. It is easy to solve but it feels kind of instable…
Have you found any solution for this?