Rider IDE Github Chat error

[darrendelorme]

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Bug

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I'm using a Mac, and the chat window does not open. The error is pasted below the steps I tried to fix this.

Steps I have tried to fix this:
1. Update JetBrains Rider: Ensure that you’re using the latest version of Rider. Sometimes, these issues are resolved in newer releases.
2. Update GitHub Copilot: Make sure GitHub Copilot is up-to-date. The interaction between Rider and Copilot may be causing UI issues.
3. Invalidate Cache and Restart Rider:
• In Rider, go to File > Invalidate Caches / Restart.
• This will clear out any stale cache that could be causing problems.
4. Reinstall GitHub Copilot Plugin: Try uninstalling and reinstalling the Copilot plugin in Rider to reset any misconfigurations that might have occurred during installation.

java.lang.IllegalArgumentException: Argument for @NotNull parameter 'fileType' of com/intellij/ide/highlighter/HighlighterFactory.createHighlighter must not be null
	at com.intellij.ide.highlighter.HighlighterFactory.$$$reportNull$$$0(HighlighterFactory.java)
	at com.intellij.ide.highlighter.HighlighterFactory.createHighlighter(HighlighterFactory.java)
	at com.intellij.ui.LanguageTextField.createEditor(LanguageTextField.java:119)
	at com.intellij.ui.EditorTextFieldProviderImpl$MyEditorTextField.createEditor(EditorTextFieldProviderImpl.java:35)
	at com.intellij.ui.EditorTextField.initEditorInner(EditorTextField.java:551)
	at com.intellij.ui.EditorTextField.initEditor(EditorTextField.java:536)
	at com.intellij.ui.EditorTextField.getEditor(EditorTextField.java:986)
	at com.intellij.ui.EditorTextField.getPreferredSize(EditorTextField.java:888)
	at java.desktop/java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:724)
	at java.desktop/java.awt.Container.preferredSize(Container.java:1826)
	at java.desktop/java.awt.Container.getPreferredSize(Container.java:1810)
	at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1732)
	at com.github.copilot.chat.message.codeblock.CodeBlockPanel$codeBlockDisplayPanel$1.getPreferredSize(CodeBlockPanel.kt:53)
	at java.desktop/javax.swing.OverlayLayout.checkRequests(OverlayLayout.java:269)
	at java.desktop/javax.swing.OverlayLayout.preferredLayoutSize(OverlayLayout.java:140)
	at java.desktop/java.awt.Container.preferredSize(Container.java:1826)
	at java.desktop/java.awt.Container.getPreferredSize(Container.java:1810)
	at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1732)
	at java.desktop/java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:724)
	at java.desktop/java.awt.Container.preferredSize(Container.java:1826)
	at java.desktop/java.awt.Container.getPreferredSize(Container.java:1810)
	at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1732)
	at org.jdesktop.swingx.VerticalLayout.preferredLayoutSize(VerticalLayout.java:80)
	at java.desktop/java.awt.Container.preferredSize(Container.java:1826)
	at java.desktop/java.awt.Container.getPreferredSize(Container.java:1810)
	at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1732)
	at java.desktop/java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:724)
	at java.desktop/java.awt.Container.preferredSize(Container.java:1826)
	at java.desktop/java.awt.Container.getPreferredSize(Container.java:1810)
	at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1732)
	at java.desktop/java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:724)
	at java.desktop/java.awt.Container.preferredSize(Container.java:1826)
	at java.desktop/java.awt.Container.getPreferredSize(Container.java:1810)
	at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1732)
	at java.desktop/java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:724)
	at java.desktop/java.awt.Container.preferredSize(Container.java:1826)
	at java.desktop/java.awt.Container.getPreferredSize(Container.java:1810)
	at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1732)
	at java.desktop/java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:724)
	at java.desktop/java.awt.Container.preferredSize(Container.java:1826)
	at java.desktop/java.awt.Container.getPreferredSize(Container.java:1810)
	at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1732)
	at java.desktop/java.awt.GridBagLayout.GetLayoutInfo(GridBagLayout.java:1111)
	at java.desktop/java.awt.GridBagLayout.getLayoutInfo(GridBagLayout.java:906)
	at java.desktop/java.awt.GridBagLayout.preferredLayoutSize(GridBagLayout.java:726)
	at java.desktop/java.awt.Container.preferredSize(Container.java:1826)
	at java.desktop/java.awt.Container.getPreferredSize(Container.java:1810)
	at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1732)
	at com.intellij.ui.components.JBScrollPane$Layout.layoutContainer(JBScrollPane.java:573)
	at java.desktop/java.awt.Container.layout(Container.java:1541)
	at java.desktop/java.awt.Container.doLayout(Container.java:1530)
	at java.desktop/java.awt.Container.validateTree(Container.java:1725)
	at java.desktop/java.awt.Container.validateTree(Container.java:1734)
	at java.desktop/java.awt.Container.validateTree(Container.java:1734)
	at java.desktop/java.awt.Container.validateTree(Container.java:1734)
	at java.desktop/java.awt.Container.validateTree(Container.java:1734)
	at java.desktop/java.awt.Container.validateTree(Container.java:1734)
	at java.desktop/java.awt.Container.validateTree(Container.java:1734)
	at java.desktop/java.awt.Container.validateTree(Container.java:1734)
	at java.desktop/java.awt.Container.validateTree(Container.java:1734)
	at java.desktop/java.awt.Container.validateTree(Container.java:1734)
	at java.desktop/java.awt.Container.validateTree(Container.java:1734)
	at java.desktop/java.awt.Container.validateTree(Container.java:1734)
	at java.desktop/java.awt.Container.validate(Container.java:1660)
	at java.desktop/javax.swing.RepaintManager$3.run(RepaintManager.java:762)
	at java.desktop/javax.swing.RepaintManager$3.run(RepaintManager.java:760)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.desktop/javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:759)
	at java.desktop/javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1920)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:781)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:728)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:722)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:750)
	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.kt:696)
	at com.intellij.ide.IdeEventQueue._dispatchEvent$lambda$16(IdeEventQueue.kt:590)
	at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithoutImplicitRead(AnyThreadWriteThreadingSupport.kt:117)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.kt:590)
	at com.intellij.ide.IdeEventQueue.access$_dispatchEvent(IdeEventQueue.kt:73)
	at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1$1$1.compute(IdeEventQueue.kt:357)
	at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1$1$1.compute(IdeEventQueue.kt:356)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:843)
	at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1$1.invoke(IdeEventQueue.kt:356)
	at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1$1.invoke(IdeEventQueue.kt:351)
	at com.intellij.ide.IdeEventQueueKt$performActivity$runnableWithWIL$1.invoke$lambda$0(IdeEventQueue.kt:1035)
	at com.intellij.openapi.application.WriteIntentReadAction.lambda$run$0(WriteIntentReadAction.java:24)
	at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:84)
	at com.intellij.openapi.application.impl.ApplicationImpl.runWriteIntentReadAction(ApplicationImpl.java:910)
	at com.intellij.openapi.application.WriteIntentReadAction.compute(WriteIntentReadAction.java:55)
	at com.intellij.openapi.application.WriteIntentReadAction.run(WriteIntentReadAction.java:23)
	at com.intellij.ide.IdeEventQueueKt$performActivity$runnableWithWIL$1.invoke(IdeEventQueue.kt:1035)
	at com.intellij.ide.IdeEventQueueKt$performActivity$runnableWithWIL$1.invoke(IdeEventQueue.kt:1035)
	at com.intellij.ide.IdeEventQueueKt.performActivity$lambda$1(IdeEventQueue.kt:1036)
	at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:106)
	at com.intellij.ide.IdeEventQueueKt.performActivity(IdeEventQueue.kt:1036)
	at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$10(IdeEventQueue.kt:351)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.kt:389)
	at com.intellij.ide.IdeEventQueue.attachClientIdIfNeeded$lambda$27(IdeEventQueue.kt:864)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:781)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:728)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:722)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:750)
	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.kt:696)
	at com.intellij.ide.IdeEventQueue._dispatchEvent$lambda$16(IdeEventQueue.kt:590)
	at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithoutImplicitRead(AnyThreadWriteThreadingSupport.kt:117)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.kt:590)
	at com.intellij.ide.IdeEventQueue.access$_dispatchEvent(IdeEventQueue.kt:73)
	at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1$1$1.compute(IdeEventQueue.kt:357)
	at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1$1$1.compute(IdeEventQueue.kt:356)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:843)
	at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1$1.invoke(IdeEventQueue.kt:356)
	at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1$1.invoke(IdeEventQueue.kt:351)
	at com.intellij.ide.IdeEventQueueKt$performActivity$runnableWithWIL$1.invoke$lambda$0(IdeEventQueue.kt:1035)
	at com.intellij.openapi.application.WriteIntentReadAction.lambda$run$0(WriteIntentReadAction.java:24)
	at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:84)
	at com.intellij.openapi.application.impl.ApplicationImpl.runWriteIntentReadAction(ApplicationImpl.java:910)
	at com.intellij.openapi.application.WriteIntentReadAction.compute(WriteIntentReadAction.java:55)
	at com.intellij.openapi.application.WriteIntentReadAction.run(WriteIntentReadAction.java:23)
	at com.intellij.ide.IdeEventQueueKt$performActivity$runnableWithWIL$1.invoke(IdeEventQueue.kt:1035)
	at com.intellij.ide.IdeEventQueueKt$performActivity$runnableWithWIL$1.invoke(IdeEventQueue.kt:1035)
	at com.intellij.ide.IdeEventQueueKt.performActivity$lambda$1(IdeEventQueue.kt:1036)
	at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:106)
	at com.intellij.ide.IdeEventQueueKt.performActivity(IdeEventQueue.kt:1036)
	at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$10(IdeEventQueue.kt:351)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.kt:397)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:207)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:92)

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[KevThompson2020]

Same issue here. Github copilot just stopped working today. I've tried updating and downgrading the plugin with no change

java.lang.IllegalArgumentException: Argument for @NotNull parameter 'fileType' of com/intellij/ide/highlighter/HighlighterFactory.createHighlighter must not be null
at com.intellij.ide.highlighter.HighlighterFactory.$$$reportNull$$$0(HighlighterFactory.java)
at com.intellij.ide.highlighter.HighlighterFactory.createHighlighter(HighlighterFactory.java)
at com.intellij.ui.LanguageTextField.createEditor(LanguageTextField.java:119)
at com.intellij.ui.EditorTextFieldProviderImpl$MyEditorTextField.createEditor(EditorTextFieldProviderImpl.java:34)
at com.intellij.ui.EditorTextField.initEditorInner(EditorTextField.java:559)
at com.intellij.ui.EditorTextField.initEditor(EditorTextField.java:544)
at com.intellij.ui.EditorTextField.getEditor(EditorTextField.java:994)
at com.intellij.ui.EditorTextField.getPreferredSize(EditorTextField.java:896)
at java.desktop/java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:724)
at java.desktop/java.awt.Container.preferredSize(Container.java:1826)
at java.desktop/java.awt.Container.getPreferredSize(Container.java:1810)
at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1732)
at com.github.copilot.chat.message.codeblock.CodeBlockPanel$codeBlockDisplayPanel$1.getPreferredSize(CodeBlockPanel.kt:53)
at java.desktop/javax.swing.OverlayLayout.checkRequests(OverlayLayout.java:269)
at java.desktop/javax.swing.OverlayLayout.preferredLayoutSize(OverlayLayout.java:140)
at java.desktop/java.awt.Container.preferredSize(Container.java:1826)
at java.desktop/java.awt.Container.getPreferredSize(Container.java:1810)
at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1732)
at java.desktop/java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:724)
at java.desktop/java.awt.Container.preferredSize(Container.java:1826)
at java.desktop/java.awt.Container.getPreferredSize(Container.java:1810)
at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1732)
at org.jdesktop.swingx.VerticalLayout.preferredLayoutSize(VerticalLayout.java:80)
at java.desktop/java.awt.Container.preferredSize(Container.java:1826)
at java.desktop/java.awt.Container.getPreferredSize(Container.java:1810)
at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1732)
at java.desktop/java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:724)
at java.desktop/java.awt.Container.preferredSize(Container.java:1826)
at java.desktop/java.awt.Container.getPreferredSize(Container.java:1810)
at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1732)
at java.desktop/java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:724)
at java.desktop/java.awt.Container.preferredSize(Container.java:1826)
at java.desktop/java.awt.Container.getPreferredSize(Container.java:1810)
at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1732)
at java.desktop/java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:724)
at java.desktop/java.awt.Container.preferredSize(Container.java:1826)
at java.desktop/java.awt.Container.getPreferredSize(Container.java:1810)
at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1732)
at java.desktop/java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:724)
at java.desktop/java.awt.Container.preferredSize(Container.java:1826)
at java.desktop/java.awt.Container.getPreferredSize(Container.java:1810)
at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1732)
at java.desktop/java.awt.GridBagLayout.GetLayoutInfo(GridBagLayout.java:1111)
at java.desktop/java.awt.GridBagLayout.getLayoutInfo(GridBagLayout.java:906)
at java.desktop/java.awt.GridBagLayout.preferredLayoutSize(GridBagLayout.java:726)
at java.desktop/java.awt.Container.preferredSize(Container.java:1826)
at java.desktop/java.awt.Container.getPreferredSize(Container.java:1810)
at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1732)
at com.intellij.ui.components.JBScrollPane$Layout.layoutContainer(JBScrollPane.java:574)
at java.desktop/java.awt.Container.layout(Container.java:1541)
at java.desktop/java.awt.Container.doLayout(Container.java:1530)
at java.desktop/java.awt.Container.validateTree(Container.java:1725)
at java.desktop/java.awt.Container.validate(Container.java:1660)
at java.desktop/javax.swing.RepaintManager$3.run(RepaintManager.java:762)
at java.desktop/javax.swing.RepaintManager$3.run(RepaintManager.java:760)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.desktop/javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:759)
at java.desktop/javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1920)
at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:101)
at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:101)
at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:107)
at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:101)
at com.intellij.util.concurrency.ContextRunnable.run(ContextRunnable.java:27)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:781)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:728)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:722)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:750)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.kt:675)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.kt:573)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$18$lambda$17$lambda$16$lambda$15(IdeEventQueue.kt:355)
at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:857)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$18$lambda$17$lambda$16(IdeEventQueue.kt:354)
at com.intellij.ide.IdeEventQueueKt.performActivity$lambda$2$lambda$1(IdeEventQueue.kt:1045)
at com.intellij.openapi.application.WriteIntentReadAction.lambda$run$0(WriteIntentReadAction.java:24)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:128)
at com.intellij.openapi.application.impl.ApplicationImpl.runWriteIntentReadAction(ApplicationImpl.java:916)
at com.intellij.openapi.application.WriteIntentReadAction.compute(WriteIntentReadAction.java:55)
at com.intellij.openapi.application.WriteIntentReadAction.run(WriteIntentReadAction.java:23)
at com.intellij.ide.IdeEventQueueKt.performActivity$lambda$2(IdeEventQueue.kt:1045)
at com.intellij.ide.IdeEventQueueKt.performActivity$lambda$3(IdeEventQueue.kt:1054)
at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:109)
at com.intellij.ide.IdeEventQueueKt.performActivity(IdeEventQueue.kt:1054)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$18(IdeEventQueue.kt:349)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.kt:387)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:207)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:92)

[KevThompson2020]

Additional information. this seems to be project specific. I created a new empty project and it works OK. going back to my main project and its dead.