# Some projects not working on PI

**URL:** <https://forum.inductiveautomation.com/t/some-projects-not-working-on-pi/38675>\
**Category:** Ignition\
**Created:** [September 14, 2020, 9:07pm UTC](https://forum.inductiveautomation.com/t/some-projects-not-working-on-pi/38675 "2020-09-14T21:07:53Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![tom](https://avatars.discourse-cdn.com/v4/letter/t/3d9bf3/32.png) [@tom](https://forum.inductiveautomation.com/u/tom)\
**Post date:** [September 14, 2020, 9:07pm UTC](https://forum.inductiveautomation.com/t/some-projects-not-working-on-pi/38675/1 "2020-09-14T21:07:54Z")

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I tried a few different examples I found to get ignition on a Pi 4, and I can get most of it to work. However I have some projects that have a popup and won’t load.

There is a popup “Unable to pen window XXXXX”  
with these details…

SerializationException: Error deserializing element “\<c”  
caused by NoClassDefFoundError: com/sun/java/swing/plaf/windows/WindowsTableHeaderUI  
caused by ClassNotFoundException: com.sun.java.swing.plaf.windows.WindowsTableHeaderUI

Ignition v7.9.14 (b2020042813)  
Java: Raspbian 11.0.8

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**Author:** ![James.Lorenz](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/james.lorenz/32/3290_2.png) [@James.Lorenz](https://forum.inductiveautomation.com/u/James.Lorenz)\
**Post date:** [September 14, 2020, 9:39pm UTC](https://forum.inductiveautomation.com/t/some-projects-not-working-on-pi/38675/2 "2020-09-14T21:39:21Z")

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You have to use either Java 8 or 9 on Ignition 7.9.

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<div class="post-metadata">

**Author:** ![tom](https://avatars.discourse-cdn.com/v4/letter/t/3d9bf3/32.png) [@tom](https://forum.inductiveautomation.com/u/tom)\
**Post date:** [September 14, 2020, 10:11pm UTC](https://forum.inductiveautomation.com/t/some-projects-not-working-on-pi/38675/3 "2020-09-14T22:11:30Z")

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Is there a specific on that I should try?

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**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [September 14, 2020, 10:25pm UTC](https://forum.inductiveautomation.com/t/some-projects-not-working-on-pi/38675/4 "2020-09-14T22:25:13Z")

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Try JDK 8 from AdoptOpenJDK: [https://adoptopenjdk.net/releases.html?variant=openjdk8&jvmVariant=hotspot](https://adoptopenjdk.net/releases.html?variant=openjdk8&jvmVariant=hotspot)