Element: class intellij.haskell.HaskellFile #Haskell because: Monads.hs (invalid) is invalid

[EmmanuelMess]

com.intellij.diagnostic.PluginException: Element: class intellij.haskell.HaskellFile #Haskell  because: [...]]/src/Monads.hs (invalid) is invalid
invalidated at: see attachment [Plugin: intellij.haskell]
	at com.intellij.ide.plugins.PluginManagerCore.createPluginException(PluginManagerCore.java:290)
	at com.intellij.diagnostic.PluginProblemReporterImpl.createPluginExceptionByClass(PluginProblemReporterImpl.java:12)
	at com.intellij.diagnostic.PluginException.createByClass(PluginException.java:92)
	at com.intellij.psi.util.PsiUtilCore.ensureValid(PsiUtilCore.java:476)
	at com.intellij.psi.impl.source.PsiFileImpl.loadTreeElement(PsiFileImpl.java:192)
	at com.intellij.psi.impl.source.PsiFileImpl.calcTreeElement(PsiFileImpl.java:734)
	at com.intellij.psi.impl.source.PsiFileImpl.getNode(PsiFileImpl.java:937)
	at com.intellij.psi.impl.source.PsiFileImpl.getFirstChild(PsiFileImpl.java:744)
	at com.intellij.psi.PsiWalkingState$PsiTreeGuide.getFirstChild(PsiWalkingState.java:46)
	at com.intellij.psi.PsiWalkingState$PsiTreeGuide.getFirstChild(PsiWalkingState.java:28)
	at com.intellij.util.WalkingState.next(WalkingState.java:70)
	at com.intellij.util.WalkingState.walkChildren(WalkingState.java:58)
	at com.intellij.util.WalkingState.elementStarted(WalkingState.java:49)
	at com.intellij.psi.PsiWalkingState.elementStarted(PsiWalkingState.java:76)
	at com.intellij.psi.PsiRecursiveElementWalkingVisitor.visitElement(PsiRecursiveElementWalkingVisitor.java:48)
	at com.intellij.psi.util.PsiTreeUtil$4.visitElement(PsiTreeUtil.java:924)
	at com.intellij.psi.PsiElementVisitor.visitFile(PsiElementVisitor.java:35)
	at com.intellij.psi.PsiRecursiveElementWalkingVisitor.visitFile(PsiRecursiveElementWalkingVisitor.java:70)
	at com.intellij.extapi.psi.PsiFileBase.accept(PsiFileBase.java:60)
	at com.intellij.psi.util.PsiTreeUtil.processElements(PsiTreeUtil.java:920)
	at com.intellij.psi.util.PsiTreeUtil.findChildOfType(PsiTreeUtil.java:235)
	at com.intellij.psi.util.PsiTreeUtil.findChildOfType(PsiTreeUtil.java:201)
	at intellij.haskell.psi.HaskellPsiUtil$.findModuleDeclaration(HaskellPsiUtil.scala:125)
	at intellij.haskell.navigation.HaskellReference.$anonfun$findModule$1(HaskellReference.scala:35)
	at scala.Option.flatMap(Option.scala:283)
	at intellij.haskell.navigation.HaskellReference.findModule(HaskellReference.scala:35)
	at intellij.haskell.navigation.HaskellReference.multiResolve(HaskellReference.scala:92)
	at com.intellij.psi.impl.source.resolve.reference.impl.PsiMultiReference.resolves(PsiMultiReference.java:51)
	at com.intellij.psi.impl.source.resolve.reference.impl.PsiMultiReference.lambda$static$0(PsiMultiReference.java:35)
	at java.base/java.util.TimSort.countRunAndMakeAscending(TimSort.java:355)
	at java.base/java.util.TimSort.sort(TimSort.java:220)
	at java.base/java.util.Arrays.sort(Arrays.java:1441)
	at com.intellij.psi.impl.source.resolve.reference.impl.PsiMultiReference.chooseReference(PsiMultiReference.java:70)
	at com.intellij.psi.impl.source.resolve.reference.impl.PsiMultiReference.resolve(PsiMultiReference.java:134)
	at com.intellij.codeInsight.TargetElementUtilBase.getReferencedElement(TargetElementUtilBase.java:177)
	at com.intellij.codeInsight.TargetElementUtilBase.doGetReferenceOrReferencedElement(TargetElementUtilBase.java:165)
	at com.intellij.codeInsight.TargetElementUtilBase.getReferenceOrReferencedElement(TargetElementUtilBase.java:204)
	at com.intellij.codeInsight.TargetElementUtilBase.getReferencedElement(TargetElementUtilBase.java:248)
	at com.intellij.codeInsight.TargetElementUtilBase.doFindTargetElement(TargetElementUtilBase.java:227)
	at com.intellij.codeInsight.TargetElementUtilBase.findTargetElement(TargetElementUtilBase.java:292)
	at com.intellij.codeInsight.TargetElementUtil.findTargetElement(TargetElementUtil.java:147)
	at com.intellij.model.psi.impl.TargetsKt.fromTargetEvaluator(targets.kt:173)
	at com.intellij.model.psi.impl.TargetsKt.declarationsOrReferences(targets.kt:134)
	at com.intellij.model.psi.impl.TargetsKt.declaredReferencedData(targets.kt:41)
	at com.intellij.model.psi.impl.TargetsKt.targetSymbols(targets.kt:23)
	at com.intellij.codeInsight.daemon.impl.IdentifierHighlighterPass.getTargetSymbols(IdentifierHighlighterPass.java:194)
	at com.intellij.codeInsight.daemon.impl.IdentifierHighlighterPass.highlightReferencesAndDeclarations(IdentifierHighlighterPass.java:186)
	at com.intellij.codeInsight.daemon.impl.IdentifierHighlighterPass.doCollectInformation(IdentifierHighlighterPass.java:91)
	at com.intellij.codeInsight.highlighting.BackgroundHighlighter.lambda$updateHighlighted$1(BackgroundHighlighter.java:150)
	at com.intellij.codeInsight.highlighting.BackgroundHighlightingUtil.lambda$lookForInjectedFileInOtherThread$0(BackgroundHighlightingUtil.java:54)
	at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$Submission.insideReadAction(NonBlockingReadActionImpl.java:521)
	at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$Submission.lambda$attemptComputation$3(NonBlockingReadActionImpl.java:486)
	at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1084)
	at com.intellij.openapi.progress.util.ProgressIndicatorUtils.lambda$runInReadActionWithWriteActionPriority$0(ProgressIndicatorUtils.java:75)
	at com.intellij.openapi.progress.util.ProgressIndicatorUtils.runActionAndCancelBeforeWrite(ProgressIndicatorUtils.java:158)
	at com.intellij.openapi.progress.util.ProgressIndicatorUtils.lambda$runWithWriteActionPriority$1(ProgressIndicatorUtils.java:115)
	at com.intellij.openapi.progress.ProgressManager.lambda$runProcess$0(ProgressManager.java:57)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:188)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$12(CoreProgressManager.java:624)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:698)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:646)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:623)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:66)
	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:175)
	at com.intellij.openapi.progress.ProgressManager.runProcess(ProgressManager.java:57)
	at com.intellij.openapi.progress.util.ProgressIndicatorUtils.runWithWriteActionPriority(ProgressIndicatorUtils.java:112)
	at com.intellij.openapi.progress.util.ProgressIndicatorUtils.runInReadActionWithWriteActionPriority(ProgressIndicatorUtils.java:75)
	at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$Submission.attemptComputation(NonBlockingReadActionImpl.java:486)
	at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$Submission.lambda$transferToBgThread$1(NonBlockingReadActionImpl.java:407)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:668)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:665)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:665)
	at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: com.intellij.psi.PsiInvalidElementAccessException: Element: class intellij.haskell.HaskellFile #Haskell  because: [...]/src/Monads.hs (invalid) is invalid
invalidated at: see attachment
	... 73 more

importing a nonexistent file.