# Designer Launch Error IllegalAccessError: class

**URL:** <https://forum.inductiveautomation.com/t/designer-launch-error-illegalaccesserror-class/101960>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [February 6, 2025, 8:28am UTC](https://forum.inductiveautomation.com/t/designer-launch-error-illegalaccesserror-class/101960 "2025-02-06T08:28:06Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![WildeKurt](https://avatars.discourse-cdn.com/v4/letter/w/50afbb/32.png) [@WildeKurt](https://forum.inductiveautomation.com/u/WildeKurt)\
**Post date:** [February 6, 2025, 8:28am UTC](https://forum.inductiveautomation.com/t/designer-launch-error-illegalaccesserror-class/101960/1 "2025-02-06T08:28:06Z")

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When trying to open a designer session today I get:

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/f/8/f8bf825eca785c413d2d81fcb71e660f284aba61.png)

I've tried rebooting. This was working yesterday. No updates to anything since then as far as I know. Here is the error in the log file:

```python
Launch failed on step "StartupStep" with error:
java.lang.IllegalAccessError: class de.javasoft.plaf.synthetica.SyntheticaLookAndFeel (in unnamed module @0x4aa36a32) cannot access class sun.swing.DefaultLookup (in module java.desktop) because module java.desktop does not export sun.swing to unnamed module @0x4aa36a32
	at de.javasoft.plaf.synthetica.SyntheticaLookAndFeel.initialize(SyntheticaLookAndFeel.java:840)
	at java.desktop/javax.swing.UIManager.setLookAndFeel(Unknown Source)
	at java.desktop/javax.swing.UIManager.setLookAndFeel(Unknown Source)
	at de.javasoft.plaf.synthetica.SyntheticaLookAndFeel.setLookAndFeelWorkaround(SyntheticaLookAndFeel.java:3767)
	at de.javasoft.plaf.synthetica.SyntheticaLookAndFeel.setLookAndFeel(SyntheticaLookAndFeel.java:3744)
	at com.inductiveautomation.ignition.client.IgnitionLookAndFeel.init(IgnitionLookAndFeel.java:68)
	at com.inductiveautomation.ignition.designer.DesignerStartupHook.staticSetup(DesignerStartupHook.java:199)
	at com.inductiveautomation.ignition.client.launch.steps.StartupStep.run(StartupStep.java:105)
	at com.inductiveautomation.ignition.client.launch.AbstractStepRunner.run(AbstractStepRunner.java:33)
	at java.base/java.lang.Thread.run(Unknown Source)

```

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<div class="post-metadata">

**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [February 6, 2025, 1:31pm UTC](https://forum.inductiveautomation.com/t/designer-launch-error-illegalaccesserror-class/101960/2 "2025-02-06T13:31:14Z")

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Probably some AV task killed one of the launch jars. Clear your local cache and try again.