I'm not sure what I did, I opned the LuaJ toolpane on a non Lua project.
java.lang.ClassCastException: class javax.swing.text.AbstractDocument$DefaultDocumentEventUndoableWrapper cannot be cast to class javax.swing.text.AbstractDocument$DefaultDocumentEvent (javax.swing.text.AbstractDocument$DefaultDocumentEventUndoableWrapper and javax.swing.text.AbstractDocument$DefaultDocumentEvent are in module java.desktop of loader 'bootstrap')
at jsyntaxpane.CompoundUndoMan.undoableEditHappened(CompoundUndoMan.java:61)
at java.desktop/javax.swing.text.AbstractDocument.fireUndoableEditUpdate(AbstractDocument.java:293)
at java.desktop/javax.swing.text.AbstractDocument.handleInsertString(AbstractDocument.java:761)
at java.desktop/javax.swing.text.AbstractDocument.insertString(AbstractDocument.java:716)
at java.desktop/javax.swing.text.PlainDocument.insertString(PlainDocument.java:131)
at se.krka.kahlua.j2se.interpreter.OutputTerminal.append(OutputTerminal.java:136)
at se.krka.kahlua.j2se.interpreter.OutputTerminal.appendInfo(OutputTerminal.java:119)
at com.sylvanaar.idea.Lua.luaj.LuaJInterpreterWindowFactory.createToolWindowContent(LuaJInterpreterWindowFactory.java:40)
at com.intellij.openapi.wm.impl.ToolWindowImpl.createContentIfNeeded$intellij_platform_ide_impl(ToolWindowImpl.kt:495)
at com.intellij.openapi.wm.impl.ToolWindowImpl.scheduleContentInitializationIfNeeded$intellij_platform_ide_impl(ToolWindowImpl.kt:475)
at com.intellij.openapi.wm.impl.ToolWindowManagerImpl.doShowWindow(ToolWindowManagerImpl.kt:921)
at com.intellij.openapi.wm.impl.ToolWindowManagerImpl.showToolWindowImpl(ToolWindowManagerImpl.kt:867)
at com.intellij.openapi.wm.impl.ToolWindowManagerImpl.activateToolWindow(ToolWindowManagerImpl.kt:578)
at com.intellij.openapi.wm.impl.ToolWindowManagerImpl.activateToolWindow$default(ToolWindowManagerImpl.kt:561)
at com.intellij.openapi.wm.impl.ToolWindowManagerImpl.activated$intellij_platform_ide_impl(ToolWindowManagerImpl.kt:1773)
at com.intellij.openapi.wm.impl.StripeButton$1.actionPerformed(StripeButton.java:62)
at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967)
at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308)
at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405)
at java.desktop/javax.swing.JToggleButton$ToggleButtonModel.setPressed(JToggleButton.java:401)
at java.desktop/javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:270)
at java.desktop/java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:297)
at java.desktop/java.awt.Component.processMouseEvent(Component.java:6650)
at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3345)
at com.intellij.openapi.wm.impl.StripeButton.processMouseEvent(StripeButton.java:312)
at java.desktop/java.awt.Component.processEvent(Component.java:6415)
at java.desktop/java.awt.Container.processEvent(Container.java:2263)
at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5025)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4857)
at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918)
at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4547)
at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307)
at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2773)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4857)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:778)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:727)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:751)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:749)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:748)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:974)
at com.intellij.ide.IdeEventQueue.dispatchMouseEvent(IdeEventQueue.java:912)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:844)
at com.intellij.ide.IdeEventQueue.lambda$null$8(IdeEventQueue.java:449)
at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:741)
at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$9(IdeEventQueue.java:448)
at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:831)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:502)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Here's my IJ version
IntelliJ IDEA 2020.1.2 Preview (Ultimate Edition)
Build #IU-201.7846.6, built on May 13, 2020
Licensed to Comuto SA / Brice Dutheil
Subscription is active until January 22, 2021
Runtime version: 11.0.7+10-b765.53 x86_64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
macOS 10.15.4
GC: ParNew, ConcurrentMarkSweep
Memory: 1981M
Cores: 8
Registry: ide.intellij.laf.enable.animation=true, ide.balloon.shadow.size=0
Non-Bundled Plugins: String Manipulation, com.github.b3er.idea.plugins.arc.browser, com.github.weisj.darkmode, Lua, GrepConsole, JOL, Lombook Plugin, com.intellij.bigdecimal-folding, org.jetbrains.plugins.spotbugs, com.mallowigi.idea, com.thvardhan.gradianto, intellij-clock, jd-intellij, name.kropp.intellij.makefile, org.intellij.plugins.hcl, org.jetbrains.plugins.go-template, com.intellij.kubernetes, Pythonid, org.jetbrains.kotlin, izhangzhihao.rainbow.brackets, com.jetbrains.packagesearch.intellij-plugin, org.asciidoctor.intellij.asciidoc, org.toml.lang, org.rust.lang
I'm not sure what I did, I opned the LuaJ toolpane on a non Lua project.
Here's my IJ version