# How to debug Designer? I get this exception

**URL:** <https://forum.inductiveautomation.com/t/how-to-debug-designer-i-get-this-exception/10738>\
**Category:** Ignition\
**Created:** [November 4, 2015, 8:12pm UTC](https://forum.inductiveautomation.com/t/how-to-debug-designer-i-get-this-exception/10738 "2015-11-04T20:12:34Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![rforbes](https://avatars.discourse-cdn.com/v4/letter/r/a88e57/32.png) [@rforbes](https://forum.inductiveautomation.com/u/rforbes)\
**Post date:** [November 4, 2015, 8:12pm UTC](https://forum.inductiveautomation.com/t/how-to-debug-designer-i-get-this-exception/10738/1 "2015-11-04T20:12:34Z")

</div>

Ignition 7.8.0 (b2015101414)  
Windows 7 64-bit

When I follow the instructions in the SDK manual (online) for debugging the Designer from Eclipse I get this fail. Is something more than launchclient.jar needed in the classpath?

Starting class: com.inductiveautomation.ignition.designer.DesignerStartupHook  
java.lang.NoClassDefFoundError: com/incors/plaf/alloy/AlloyTheme  
at java.lang.Class.getDeclaredConstructors0(Native Method)  
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2658)  
at java.lang.Class.getConstructor0(Class.java:2964)  
at java.lang.Class.newInstance(Class.java:403)  
at com.inductiveautomation.ignition.client.launch.steps.StartupStep.run(StartupStep.java:107)

Rob