运行项目时，报如下错误:
1null 2 3 java.lang.NullPointerException 4 at com.intellij.openapi.vfs.impl.local.LocalFileSystemBase.findFileByIoFile(LocalFileSystemBase.java:79) 5 at com.intellij.openapi.vfs.VfsUtil.findFileByIoFile(VfsUtil.java:232) 6 at com.android.tools.idea.model.ManifestInfo$ManifestFile.getLibManifests(ManifestInfo.java:406) 7 at com.android.tools.idea.model.ManifestInfo$ManifestFile.refresh(ManifestInfo.java:339) 8 at com.android.tools.idea.model.MergedManifest.syncWithReadPermission(MergedManifest.java:377) 9 at com.android.tools.idea.model.MergedManifest$2.run(MergedManifest.java:356) 10 at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:843) 11 at com.android.tools.idea.model.MergedManifest.sync(MergedManifest.java:353) 12 at com.android.tools.idea.model.MergedManifest.getDefaultTheme(MergedManifest.java:219) 13 at com.android.tools.idea.configurations.ConfigurationManager.computePreferredTheme(ConfigurationManager.java:340) 14 at com.android.tools.idea.configurations.Configuration.getTheme(Configuration.java:581) 15 at com.android.tools.idea.uibuilder.model.NlModel.updateTrackingConfiguration(NlModel.java:1987) 16 at com.android.tools.idea.uibuilder.model.NlModel.<init>(NlModel.java:179) 17 at com.android.tools.idea.uibuilder.model.NlModel.create(NlModel.java:161) 18 at com.android.tools.idea.uibuilder.editor.NlEditorPanel.<init>(NlEditorPanel.java:58) 19 at com.android.tools.idea.uibuilder.editor.NlEditor.getComponent(NlEditor.java:53) 20 at com.android.tools.idea.uibuilder.editor.NlEditor.getComponent(NlEditor.java:35) 21 at com.intellij.openapi.fileEditor.impl.EditorComposite.createEditorComponent(EditorComposite.java:187) 22 at com.intellij.openapi.fileEditor.impl.EditorComposite.createTabbedPaneWrapper(EditorComposite.java:176) 23 at com.intellij.openapi.fileEditor.impl.EditorComposite.<init>(EditorComposite.java:119) 24 at com.intellij.openapi.fileEditor.impl.EditorWithProviderComposite.<init>(EditorWithProviderComposite.java:40) 25 at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl.createComposite(FileEditorManagerImpl.java:1020) 26 at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl.lambda$openFileImpl4$6(FileEditorManagerImpl.java:890) 27 at com.intellij.util.ui.UIUtil.invokeAndWaitIfNeeded(UIUtil.java:2453) 28 at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl.openFileImpl4(FileEditorManagerImpl.java:971) 29 at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl.openFileImpl3(FileEditorManagerImpl.java:788) 30 at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl.lambda$openFileImpl2$4(FileEditorManagerImpl.java:770) 31 at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:122) 32 at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:100) 33 at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:86) 34 at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl.openFileImpl2(FileEditorManagerImpl.java:770) 35 at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl.openFileWithProviders(FileEditorManagerImpl.java:711) 36 at com.intellij.openapi.fileEditor.ex.FileEditorManagerEx.openFile(FileEditorManagerEx.java:151) 37 at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl.lambda$openEditor$9(FileEditorManagerImpl.java:1151) 38 at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:129) 39 at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:100) 40 at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:86) 41 at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl.openEditor(FileEditorManagerImpl.java:1149) 42 at com.intellij.openapi.fileEditor.OpenFileDescriptor.navigateInAnyFileEditor(OpenFileDescriptor.java:146) 43 at com.intellij.openapi.fileEditor.OpenFileDescriptor.navigateInEditor(OpenFileDescriptor.java:132) 44 at com.intellij.openapi.fileEditor.OpenFileDescriptor.navigateInEditorOrNativeApp(OpenFileDescriptor.java:128) 45 at com.intellij.openapi.fileEditor.OpenFileDescriptor.navigate(OpenFileDescriptor.java:115) 46 at com.intellij.psi.impl.source.PsiFileImpl.navigate(PsiFileImpl.java:1007) 47 at com.intellij.codeInsight.navigation.NavigationUtil.openFileWithPsiElement(NavigationUtil.java:176) 48 at com.intellij.ide.projectView.impl.nodes.AbstractPsiBasedNode.navigate(AbstractPsiBasedNode.java:235) 49 at com.intellij.ide.projectView.impl.nodes.AbstractPsiBasedNode.navigate(AbstractPsiBasedNode.java:245) 50 at com.intellij.ide.projectView.impl.nodes.PsiFileNode.navigate(PsiFileNode.java:133) 51 at com.intellij.util.OpenSourceUtil.navigate(OpenSourceUtil.java:53) 52 at com.intellij.util.OpenSourceUtil.openSourcesFrom(OpenSourceUtil.java:31) 53 at com.intellij.util.EditSourceOnDoubleClickHandler$TreeMouseListener.processDoubleClick(EditSourceOnDoubleClickHandler.java:130) 54 at com.intellij.util.EditSourceOnDoubleClickHandler$TreeMouseListener.onDoubleClick(EditSourceOnDoubleClickHandler.java:122) 55 at com.intellij.ui.DoubleClickListener.onClick(DoubleClickListener.java:30) 56 at com.intellij.ui.ClickListener$1.mouseReleased(ClickListener.java:73) 57 at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:290) 58 at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289) 59 at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289) 60 at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289) 61 at java.awt.Component.processMouseEvent(Component.java:6533) 62 at javax.swing.JComponent.processMouseEvent(JComponent.java:3324) 63 at com.intellij.ui.treeStructure.Tree.processMouseEvent(Tree.java:443) 64 at com.intellij.ide.dnd.aware.DnDAwareTree.processMouseEvent(DnDAwareTree.java:59) 65 at java.awt.Component.processEvent(Component.java:6298) 66 at java.awt.Container.processEvent(Container.java:2236) 67 at java.awt.Component.dispatchEventImpl(Component.java:4889) 68 at java.awt.Container.dispatchEventImpl(Container.java:2294) 69 at java.awt.Component.dispatchEvent(Component.java:4711) 70 at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888) 71 at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525) 72 at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466) 73 at java.awt.Container.dispatchEventImpl(Container.java:2280) 74 at java.awt.Window.dispatchEventImpl(Window.java:2746) 75 at java.awt.Component.dispatchEvent(Component.java:4711) 76 at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758) 77 at java.awt.EventQueue.access$500(EventQueue.java:97) 78 at java.awt.EventQueue$3.run(EventQueue.java:709) 79 at java.awt.EventQueue$3.run(EventQueue.java:703) 80 at java.security.AccessController.doPrivileged(Native Method) 81 at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) 82 at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90) 83 at java.awt.EventQueue$4.run(EventQueue.java:731) 84 at java.awt.EventQueue$4.run(EventQueue.java:729) 85 at java.security.AccessController.doPrivileged(Native Method) 86 at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) 87 at java.awt.EventQueue.dispatchEvent(EventQueue.java:728) 88 at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:795) 89 at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:627) 90 at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:387) 91 at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) 92 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) 93 at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) 94 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) 95 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) 96 at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
解决方法 Solution
Try 【Sync Project with Gradle Files】
