Unable to open xml files in editor

 Hi,

When I double click on an xml file in the project panel it does not open the file in the editor panel.  Other types of file such as .java work well.  Any idea what the cause or issue is?

Below is the error that is thrown in the logs.

Thanks and regards

Malcolm

2017-11-08 14:55:58,836 [17279772]  ERROR - tor.impl.FileEditorManagerImpl - Current Command:  
2017-11-08 15:04:42,751 [17803687]  ERROR - tor.impl.FileEditorManagerImpl - provider must be null to have equal deserialized elements
java.lang.AssertionError: provider must be null to have equal deserialized elements
    at com.intellij.lang.javascript.index.JSImplicitElementsIndex$JSElementProxy.<init>(JSImplicitElementsIndex.java:124)
    at org.angularjs.index.AngularJS2IndexingHandler.processCustomElement(AngularJS2IndexingHandler.java:118)
    at com.intellij.lang.javascript.index.JSCustomIndexer.visitElement(JSCustomIndexer.java:59)
    at com.intellij.psi.impl.source.xml.XmlTagImpl.accept(XmlTagImpl.java:1079)
    at com.intellij.psi.PsiWalkingState.visit(PsiWalkingState.java:64)
    at com.intellij.psi.PsiWalkingState.visit(PsiWalkingState.java:26)
    at com.intellij.util.WalkingState.walkChildren(WalkingState.java:65)
    at com.intellij.util.WalkingState.elementStarted(WalkingState.java:52)
    at com.intellij.psi.PsiWalkingState.elementStarted(PsiWalkingState.java:73)
    at com.intellij.lang.javascript.psi.JSRecursiveWalkingElementVisitor.visitElement(JSRecursiveWalkingElementVisitor.java:27)
    at com.intellij.lang.javascript.index.JSCustomIndexer.visitElement(JSCustomIndexer.java:66)
    at com.intellij.psi.impl.source.xml.XmlDocumentImpl.accept(XmlDocumentImpl.java:93)
    at com.intellij.psi.impl.source.tree.SharedImplUtil.acceptChildren(SharedImplUtil.java:199)
    at com.intellij.psi.impl.source.PsiFileImpl.acceptChildren(PsiFileImpl.java:820)
    at com.intellij.lang.javascript.index.JSIndexContent.acceptChildren(JSIndexContent.java:84)
    at com.intellij.lang.javascript.index.JSIndexContent.createFromFile(JSIndexContent.java:71)
    at com.intellij.lang.javascript.index.JSIndexContent.access$000(JSIndexContent.java:23)
    at com.intellij.lang.javascript.index.JSIndexContent$1.compute(JSIndexContent.java:116)
    at com.intellij.psi.util.CachedValuesManager$1.compute(CachedValuesManager.java:137)
    at com.intellij.psi.impl.PsiCachedValueImpl.doCompute(PsiCachedValueImpl.java:49)
    at com.intellij.util.CachedValueBase.getValueWithLock(CachedValueBase.java:222)
    at com.intellij.psi.impl.PsiCachedValue.getValueWithLock(PsiCachedValue.java:66)
    at com.intellij.psi.impl.PsiCachedValueImpl.getValue(PsiCachedValueImpl.java:38)
    at com.intellij.util.CachedValuesManagerImpl.getCachedValue(CachedValuesManagerImpl.java:84)
    at com.intellij.psi.util.CachedValuesManager.getCachedValue(CachedValuesManager.java:133)
    at com.intellij.lang.javascript.index.JSIndexContent.get(JSIndexContent.java:112)
    at com.intellij.lang.javascript.index.JSIndexContent.indexFile(JSIndexContent.java:55)
    at com.intellij.lang.javascript.index.JSCustomSingleEntriesIndex$1.map(JSCustomSingleEntriesIndex.java:25)
    at com.intellij.lang.javascript.index.JSCustomSingleEntriesIndex$1.map(JSCustomSingleEntriesIndex.java:21)
    at com.intellij.util.indexing.MapReduceIndex.update(MapReduceIndex.java:398)
    at com.intellij.util.indexing.FileBasedIndexImpl.updateSingleIndex(FileBasedIndexImpl.java:1831)
    at com.intellij.util.indexing.FileBasedIndexImpl$23.run(FileBasedIndexImpl.java:1760)
    at com.intellij.openapi.fileTypes.impl.FileTypeManagerImpl.freezeFileTypeTemporarilyIn(FileTypeManagerImpl.java:510)
    at com.intellij.util.indexing.FileBasedIndexImpl.a(FileBasedIndexImpl.java:1718)
    at com.intellij.util.indexing.FileBasedIndexImpl.indexFileContent(FileBasedIndexImpl.java:1703)
    at com.intellij.util.indexing.FileBasedIndexImpl.processRefreshedFile(FileBasedIndexImpl.java:1684)
    at com.intellij.util.indexing.FileBasedIndexImpl$VirtualFileUpdateTask.doProcess(FileBasedIndexImpl.java:1848)
    at com.intellij.util.indexing.FileBasedIndexImpl$VirtualFileUpdateTask.doProcess(FileBasedIndexImpl.java:1845)
    at com.intellij.util.indexing.UpdateTask.a(UpdateTask.java:80)
    at com.intellij.util.indexing.UpdateTask.processAll(UpdateTask.java:47)
    at com.intellij.util.indexing.FileBasedIndexImpl.a(FileBasedIndexImpl.java:1867)
    at com.intellij.util.indexing.FileBasedIndexImpl.ensureUpToDate(FileBasedIndexImpl.java:887)
    at com.intellij.util.indexing.FileBasedIndexImpl.ensureUpToDate(FileBasedIndexImpl.java:855)
    at com.intellij.psi.stubs.StubIndexImpl.a(StubIndexImpl.java:243)
    at com.intellij.psi.stubs.StubIndexImpl.processElements(StubIndexImpl.java:224)
    at com.intellij.psi.stubs.StubIndexImpl.processElements(StubIndexImpl.java:213)
    at org.angularjs.index.AngularIndexUtil.resolve(AngularIndexUtil.java:50)
    at org.angularjs.index.AngularIndexUtil$3.compute(AngularIndexUtil.java:116)
    at com.intellij.psi.impl.PsiCachedValueImpl.doCompute(PsiCachedValueImpl.java:49)
    at com.intellij.util.CachedValueBase.getValueWithLock(CachedValueBase.java:222)
    at com.intellij.psi.impl.PsiCachedValue.getValueWithLock(PsiCachedValue.java:66)
    at com.intellij.psi.impl.PsiCachedValueImpl.getValue(PsiCachedValueImpl.java:38)
    at com.intellij.util.CachedValuesManagerImpl.getCachedValue(CachedValuesManagerImpl.java:84)
    at com.intellij.psi.util.CachedValuesManager.getCachedValue(CachedValuesManager.java:119)
    at org.angularjs.index.AngularIndexUtil.getAngularJSVersion(AngularIndexUtil.java:110)
    at org.angularjs.index.AngularIndexUtil.hasAngularJS(AngularIndexUtil.java:87)
    at org.angularjs.editor.AngularJSInjector.getLanguagesToInject(AngularJSInjector.java:37)
    at com.intellij.psi.impl.source.tree.injected.InjectedPsiCachedValueProvider$MyInjProcessor.process(InjectedPsiCachedValueProvider.java:82)
    at com.intellij.psi.impl.source.tree.injected.InjectedLanguageManagerImpl.processInPlaceInjectorsFor(InjectedLanguageManagerImpl.java:474)
    at com.intellij.psi.impl.source.tree.injected.InjectedPsiCachedValueProvider.doCompute(InjectedPsiCachedValueProvider.java:62)
    at com.intellij.psi.impl.source.tree.injected.InjectedLanguageUtil.a(InjectedLanguageUtil.java:316)
    at com.intellij.psi.impl.source.tree.injected.InjectedLanguageUtil.enumerate(InjectedLanguageUtil.java:145)
    at com.intellij.psi.formatter.common.InjectedLanguageBlockBuilder.addInjectedBlocks(InjectedLanguageBlockBuilder.java:111)
    at com.intellij.psi.formatter.xml.AbstractXmlBlock.buildInjectedPsiBlocks(AbstractXmlBlock.java:438)
    at com.intellij.psi.formatter.xml.XmlTagBlock.processChild(XmlTagBlock.java:148)
    at com.intellij.psi.formatter.xml.XmlTagBlock.buildChildren(XmlTagBlock.java:119)
    at com.intellij.psi.formatter.common.AbstractBlock.getSubBlocks(AbstractBlock.java:62)
    at com.intellij.psi.formatter.common.NewLineBlocksIterator.a(NewLineBlocksIterator.java:115)
    at com.intellij.psi.formatter.common.NewLineBlocksIterator.a(NewLineBlocksIterator.java:100)
    at com.intellij.psi.formatter.common.NewLineBlocksIterator.a(NewLineBlocksIterator.java:55)
    at com.intellij.psi.formatter.common.NewLineBlocksIterator.hasNext(NewLineBlocksIterator.java:48)
    at com.intellij.psi.codeStyle.autodetect.FormatterBasedLineIndentInfoBuilder.a(FormatterBasedLineIndentInfoBuilder.java:132)
    at com.intellij.psi.codeStyle.autodetect.FormatterBasedLineIndentInfoBuilder.build(FormatterBasedLineIndentInfoBuilder.java:49)
    at com.intellij.psi.codeStyle.autodetect.IndentOptionsDetectorImpl.b(IndentOptionsDetectorImpl.java:80)
    at com.intellij.psi.codeStyle.autodetect.IndentOptionsDetectorImpl.getIndentOptions(IndentOptionsDetectorImpl.java:59)
    at com.intellij.psi.codeStyle.autodetect.DetectableIndentOptionsProvider.getIndentOptions(DetectableIndentOptionsProvider.java:56)
    at com.intellij.psi.codeStyle.CodeStyleSettings.getIndentOptionsByFile(CodeStyleSettings.java:672)
    at com.intellij.psi.codeStyle.CodeStyleSettings.getIndentOptionsByFile(CodeStyleSettings.java:636)
    at com.intellij.psi.codeStyle.CodeStyleSettings.getIndentOptionsByFile(CodeStyleSettings.java:631)
    at com.intellij.openapi.editor.impl.SettingsImpl.getTabSize(SettingsImpl.java:363)
    at com.intellij.openapi.editor.ex.util.EditorUtil.getTabSize(EditorUtil.java:590)
    at com.intellij.openapi.editor.impl.view.EditorView.getTabSize(EditorView.java:423)
    at com.intellij.openapi.editor.impl.view.LogicalPositionCache.reset(LogicalPositionCache.java:70)
    at com.intellij.openapi.editor.impl.view.EditorView.reinitSettings(EditorView.java:281)
    at com.intellij.openapi.editor.impl.EditorImpl.<init>(EditorImpl.java:566)
    at com.intellij.openapi.editor.impl.EditorFactoryImpl.a(EditorFactoryImpl.java:193)
    at com.intellij.openapi.editor.impl.EditorFactoryImpl.createEditor(EditorFactoryImpl.java:169)
    at com.intellij.openapi.fileEditor.impl.text.TextEditorComponent.d(TextEditorComponent.java:165)
    at com.intellij.openapi.fileEditor.impl.text.TextEditorComponent.<init>(TextEditorComponent.java:100)
    at com.intellij.openapi.fileEditor.impl.text.PsiAwareTextEditorImpl$PsiAwareTextEditorComponent.<init>(PsiAwareTextEditorImpl.java:62)
    at com.intellij.openapi.fileEditor.impl.text.PsiAwareTextEditorImpl$PsiAwareTextEditorComponent.<init>(PsiAwareTextEditorImpl.java:55)
    at com.intellij.openapi.fileEditor.impl.text.PsiAwareTextEditorImpl.createEditorComponent(PsiAwareTextEditorImpl.java:44)
    at com.intellij.openapi.fileEditor.impl.text.TextEditorImpl.<init>(TextEditorImpl.java:46)
    at com.intellij.openapi.fileEditor.impl.text.PsiAwareTextEditorImpl.<init>(PsiAwareTextEditorImpl.java:38)
    at com.intellij.openapi.fileEditor.impl.text.PsiAwareTextEditorProvider$1.build(PsiAwareTextEditorProvider.java:78)
    at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl$14.run(FileEditorManagerImpl.java:894)
    at com.intellij.util.ui.UIUtil.invokeAndWaitIfNeeded(UIUtil.java:2426)
    at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl.openFileImpl4(FileEditorManagerImpl.java:876)
    at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl.openFileImpl3(FileEditorManagerImpl.java:810)
    at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl$11.run(FileEditorManagerImpl.java:790)
    at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:117)
    at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:99)
    at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:85)
    at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl.openFileImpl2(FileEditorManagerImpl.java:787)
    at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl.openFileWithProviders(FileEditorManagerImpl.java:728)
    at com.intellij.openapi.fileEditor.ex.FileEditorManagerEx.openFile(FileEditorManagerEx.java:151)
    at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl$17.run(FileEditorManagerImpl.java:1156)
    at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:124)
    at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:99)
    at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:85)
    at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl.openEditor(FileEditorManagerImpl.java:1152)
    at com.intellij.openapi.fileEditor.OpenFileDescriptor.navigateInAnyFileEditor(OpenFileDescriptor.java:146)
    at com.intellij.openapi.fileEditor.OpenFileDescriptor.navigateInEditor(OpenFileDescriptor.java:132)
    at com.intellij.openapi.fileEditor.OpenFileDescriptor.navigateInEditorOrNativeApp(OpenFileDescriptor.java:128)
    at com.intellij.openapi.fileEditor.OpenFileDescriptor.navigate(OpenFileDescriptor.java:115)
    at com.intellij.psi.impl.source.PsiFileImpl.navigate(PsiFileImpl.java:982)
    at com.intellij.codeInsight.navigation.NavigationUtil.openFileWithPsiElement(NavigationUtil.java:179)
    at com.intellij.ide.projectView.impl.nodes.AbstractPsiBasedNode.navigate(AbstractPsiBasedNode.java:238)
    at com.intellij.ide.projectView.impl.nodes.AbstractPsiBasedNode.navigate(AbstractPsiBasedNode.java:248)
    at com.intellij.ide.projectView.impl.nodes.PsiFileNode.navigate(PsiFileNode.java:133)
    at com.intellij.util.OpenSourceUtil.navigate(OpenSourceUtil.java:53)
    at com.intellij.util.OpenSourceUtil.openSourcesFrom(OpenSourceUtil.java:31)
    at com.intellij.util.EditSourceOnDoubleClickHandler$TreeMouseListener.processDoubleClick(EditSourceOnDoubleClickHandler.java:130)
    at com.intellij.util.EditSourceOnDoubleClickHandler$TreeMouseListener.onDoubleClick(EditSourceOnDoubleClickHandler.java:122)
    at com.intellij.ui.DoubleClickListener.onClick(DoubleClickListener.java:30)
    at com.intellij.ui.ClickListener$1.mouseReleased(ClickListener.java:73)
    at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:290)
    at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
    at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
    at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
    at java.awt.Component.processMouseEvent(Component.java:6535)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
    at com.intellij.ui.treeStructure.Tree.processMouseEvent(Tree.java:410)
    at com.intellij.ide.dnd.aware.DnDAwareTree.processMouseEvent(DnDAwareTree.java:58)
    at java.awt.Component.processEvent(Component.java:6300)
    at java.awt.Container.processEvent(Container.java:2236)
    at java.awt.Component.dispatchEventImpl(Component.java:4891)
    at java.awt.Container.dispatchEventImpl(Container.java:2294)
    at java.awt.Component.dispatchEvent(Component.java:4713)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
    at java.awt.Container.dispatchEventImpl(Container.java:2280)
    at java.awt.Window.dispatchEventImpl(Window.java:2750)
    at java.awt.Component.dispatchEvent(Component.java:4713)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
    at java.awt.EventQueue.access$500(EventQueue.java:97)
    at java.awt.EventQueue$3.run(EventQueue.java:709)
    at java.awt.EventQueue$3.run(EventQueue.java:703)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
    at java.awt.EventQueue$4.run(EventQueue.java:731)
    at java.awt.EventQueue$4.run(EventQueue.java:729)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
    at com.intellij.ide.IdeEventQueue.c(IdeEventQueue.java:857)
    at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:654)
    at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:386)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
2017-11-08 15:04:42,752 [17803688]  ERROR - tor.impl.FileEditorManagerImpl - IntelliJ IDEA 2016.1.4  Build #IU-145.2070.6
2017-11-08 15:04:42,753 [17803689]  ERROR - tor.impl.FileEditorManagerImpl - JDK: 1.8.0_77
2017-11-08 15:04:42,753 [17803689]  ERROR - tor.impl.FileEditorManagerImpl - VM: Java HotSpot(TM) Server VM
2017-11-08 15:04:42,753 [17803689]  ERROR - tor.impl.FileEditorManagerImpl - Vendor: Oracle Corporation
2017-11-08 15:04:42,753 [17803689]  ERROR - tor.impl.FileEditorManagerImpl - OS: Windows 7
2017-11-08 15:04:42,753 [17803689]  ERROR - tor.impl.FileEditorManagerImpl - Last Action: ShowLog
2017-11-08 15:04:42,753 [17803689]  ERROR - tor.impl.FileEditorManagerImpl - Current Command: