# ClassNotFoundException launching Designer

**URL:** <https://forum.inductiveautomation.com/t/classnotfoundexception-launching-designer/20908>\
**Category:** Ignition Early Access\
**Created:** [November 16, 2018, 6:19pm UTC](https://forum.inductiveautomation.com/t/classnotfoundexception-launching-designer/20908 "2018-11-16T18:19:06Z")\
**Posts on this page:** 1\
**Showing post:** 14

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**Author:** ![jcoffman](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/jcoffman/32/6429_2.png) [@jcoffman](https://forum.inductiveautomation.com/u/jcoffman)\
**Post date:** [December 3, 2018, 4:02pm UTC](https://forum.inductiveautomation.com/t/classnotfoundexception-launching-designer/20908/14 "2018-12-03T16:02:14Z")

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Ok it looks like that particular gateway was set to be the Default application in settings. Could you try something for me? Open the Designer launcher and when you see the auto-launching screen select Cancel on the bottom. You will then see a screen similar to the one that I posted. Click on the manage button on the thee-dots button to the right of the name of the Ignition-LAPTOP-RLSQD170 Designer: ![image](https://us1.discourse-cdn.com/inductiveautomation/original/2X/f/f2615024cd12eb8b6df5876f6ccab3041c8ebb8a.png)  
Delete the application. After doing this, re-add it by click the blue “Add Designer” button and attempt to launch again.

Thanks,  
Jonathan C

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