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    Expert tip

    Try "File -> Invalidate Cache" and restarting, this should kill old indexing process and start a new one, wait until it's finished and let the project build.

com.intellij.openapi.project.IndexNotReadyException: Please change caller according to com.intellij.openapi.project.IndexNotReadyException documentation	at com.intellij.util.indexing.FileBasedIndexImpl.a(FileBasedIndexImpl.java:722)	at com.intellij.util.indexing.FileBasedIndexImpl.ensureUpToDate(FileBasedIndexImpl.java:671)	at com.intellij.util.indexing.FileBasedIndexImpl.ensureUpToDate(FileBasedIndexImpl.java:654)	at com.intellij.psi.stubs.StubIndexImpl.a(StubIndexImpl.java:346)	at com.intellij.psi.stubs.StubIndexImpl.processElements(StubIndexImpl.java:327)	at com.intellij.psi.stubs.StubIndex.getElements(StubIndex.java:146)	at com.intellij.psi.stubs.StubIndex.getElements(StubIndex.java:135)	at com.intellij.psi.impl.java.stubs.index.JavaFullClassNameIndex.get(JavaFullClassNameIndex.java:48)	at com.intellij.psi.impl.file.impl.JavaFileManagerImpl.doFindClasses(JavaFileManagerImpl.java:96)	at com.intellij.psi.impl.file.impl.JavaFileManagerImpl.findClasses(JavaFileManagerImpl.java:83)	at com.intellij.psi.impl.PsiElementFinderImpl.findClasses(PsiElementFinderImpl.java:60)	at com.intellij.psi.impl.JavaPsiFacadeImpl.findClasses(JavaPsiFacadeImpl.java:173)	at org.twodividedbyzero.idea.findbugs.common.util.IdeaUtilImpl.findJavaPsiClass(IdeaUtilImpl.java:378)	at org.twodividedbyzero.idea.findbugs.common.util.IdeaUtilImpl.findJavaPsiClass(IdeaUtilImpl.java:370)	at org.twodividedbyzero.idea.findbugs.gui.tree.model.BugInstanceNode.getPsiFile(BugInstanceNode.java:91)	at org.twodividedbyzero.idea.findbugs.gui.tree.model.GroupTreeModel.addProblem(GroupTreeModel.java:107)	at org.twodividedbyzero.idea.findbugs.gui.tree.model.GroupTreeModel.addToGroup(GroupTreeModel.java:207)	at org.twodividedbyzero.idea.findbugs.gui.tree.model.GroupTreeModel.startSubGroup(GroupTreeModel.java:187)	at org.twodividedbyzero.idea.findbugs.gui.tree.model.GroupTreeModel.startSubGroup(GroupTreeModel.java:185)	at org.twodividedbyzero.idea.findbugs.gui.tree.model.GroupTreeModel.startGroup(GroupTreeModel.java:159)	at org.twodividedbyzero.idea.findbugs.gui.tree.model.GroupTreeModel.startGroup(GroupTreeModel.java:45)	at org.twodividedbyzero.idea.findbugs.gui.tree.model.Grouper.group(Grouper.java:129)	at org.twodividedbyzero.idea.findbugs.gui.tree.model.GroupTreeModel.group(GroupTreeModel.java:143)	at org.twodividedbyzero.idea.findbugs.gui.tree.model.GroupTreeModel.addNode(GroupTreeModel.java:135)	at org.twodividedbyzero.idea.findbugs.gui.toolwindow.view.BugTreePanel.addNode(BugTreePanel.java:118)	at org.twodividedbyzero.idea.findbugs.gui.toolwindow.view.ToolWindowPanel$2.newBug(ToolWindowPanel.java:132)	at sun.reflect.GeneratedMethodAccessor1761.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.twodividedbyzero.idea.findbugs.messages.MessageBus$1.invoke(MessageBus.java:80)	at com.sun.proxy.$Proxy176.newBug(Unknown Source)	at org.twodividedbyzero.idea.findbugs.messages.MessageBusManager.publishNewBug(MessageBusManager.java:81)	at org.twodividedbyzero.idea.findbugs.core.Reporter$2.run(Reporter.java:145)	at org.twodividedbyzero.idea.findbugs.core.Reporter$RunnableProcessor.process(Reporter.java:315)	at org.twodividedbyzero.idea.findbugs.core.Reporter$RunnableProcessor.process(Reporter.java:312)	at com.intellij.util.containers.TransferToEDTQueue.processNext(TransferToEDTQueue.java:99)	at com.intellij.util.containers.TransferToEDTQueue.access$300(TransferToEDTQueue.java:37)	at com.intellij.util.containers.TransferToEDTQueue$1.run(TransferToEDTQueue.java:58)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)	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:80)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)	at com.intellij.ide.IdeEventQueue.c(IdeEventQueue.java:818)	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:655)	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:365)	at com.intellij.ide.IdeEventQueue.pumpEventsForHierarchy(IdeEventQueue.java:914)	at com.intellij.openapi.progress.util.ProgressWindow.startBlocking(ProgressWindow.java:210)	at com.intellij.openapi.progress.util.ProgressWindow.startBlocking(ProgressWindow.java:197)	at com.intellij.openapi.application.impl.ApplicationImpl.runProcessWithProgressSynchronously(ApplicationImpl.java:608)	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcessWithProgressSynchronously(CoreProgressManager.java:448)	at com.intellij.openapi.progress.impl.ProgressManagerImpl.runProcessWithProgressSynchronously(ProgressManagerImpl.java:89)	at com.intellij.openapi.progress.impl.CoreProgressManager$8.run(CoreProgressManager.java:351)	at com.intellij.openapi.progress.impl.CoreProgressManager.a(CoreProgressManager.java:355)	at com.intellij.openapi.progress.impl.CoreProgressManager.run(CoreProgressManager.java:334)	at com.intellij.openapi.progress.Task.queue(Task.java:113)	at org.twodividedbyzero.idea.findbugs.core.FindBugsStarter.startImpl(FindBugsStarter.java:210)	at org.twodividedbyzero.idea.findbugs.core.FindBugsStarter.start(FindBugsStarter.java:168)	at org.twodividedbyzero.idea.findbugs.core.CheckinHandlerFactoryImpl$1.beforeCheckin(CheckinHandlerFactoryImpl.java:103)	at com.intellij.openapi.vcs.changes.ui.CommitChangeListDialog$8.compute(CommitChangeListDialog.java:887)	at com.intellij.openapi.vcs.changes.ui.CommitChangeListDialog$8.compute(CommitChangeListDialog.java:880)	at com.intellij.openapi.vcs.changes.ui.CommitChangeListDialog$9.run(CommitChangeListDialog.java:915)	at com.intellij.openapi.vcs.checkin.ReformatBeforeCheckinHandler$2.run(ReformatBeforeCheckinHandler.java:89)	at com.intellij.openapi.vcs.checkin.ReformatBeforeCheckinHandler.runCheckinHandlers(ReformatBeforeCheckinHandler.java:99)	at com.intellij.openapi.vcs.changes.ui.CommitChangeListDialog$10.run(CommitChangeListDialog.java:924)	at com.intellij.openapi.vcs.checkin.RearrangeBeforeCheckinHandler$2.run(RearrangeBeforeCheckinHandler.java:84)	at com.intellij.openapi.vcs.checkin.RearrangeBeforeCheckinHandler.runCheckinHandlers(RearrangeBeforeCheckinHandler.java:94)	at com.intellij.openapi.vcs.changes.ui.CommitChangeListDialog$10.run(CommitChangeListDialog.java:924)	at com.intellij.openapi.vcs.checkin.OptimizeImportsBeforeCheckinHandler.runCheckinHandlers(OptimizeImportsBeforeCheckinHandler.java:99)	at com.intellij.openapi.vcs.changes.ui.CommitChangeListDialog$10.run(CommitChangeListDialog.java:924)	at com.intellij.openapi.vcs.checkin.CodeCleanupCheckinHandlerFactory$CleanupCodeCheckinHandler.runCheckinHandlers(CodeCleanupCheckinHandlerFactory.java:91)	at com.intellij.openapi.vcs.changes.ui.CommitChangeListDialog$10.run(CommitChangeListDialog.java:924)	at com.intellij.openapi.vcs.changes.ui.CommitChangeListDialog.c(CommitChangeListDialog.java:929)	at com.intellij.openapi.vcs.changes.ui.CommitChangeListDialog.l(CommitChangeListDialog.java:685)	at com.intellij.openapi.vcs.changes.ui.CommitChangeListDialog.a(CommitChangeListDialog.java:1185)	at com.intellij.openapi.vcs.changes.ui.CommitChangeListDialog.b(CommitChangeListDialog.java:682)	at com.intellij.openapi.vcs.changes.ui.CommitChangeListDialog.access$900(CommitChangeListDialog.java:71)	at com.intellij.openapi.vcs.changes.ui.CommitChangeListDialog$CommitAction.actionPerformed(CommitChangeListDialog.java:632)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)	at java.awt.Component.processMouseEvent(Component.java:6533)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)	at com.intellij.ui.components.JBOptionButton.processMouseEvent(JBOptionButton.java:171)	at java.awt.Component.processEvent(Component.java:6298)	at java.awt.Container.processEvent(Container.java:2236)	at java.awt.Component.dispatchEventImpl(Component.java:4889)	at java.awt.Container.dispatchEventImpl(Container.java:2294)	at java.awt.Component.dispatchEvent(Component.java:4711)	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:2746)	at java.awt.Component.dispatchEvent(Component.java:4711)	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:80)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)	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:80)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)	at com.intellij.ide.IdeEventQueue.c(IdeEventQueue.java:818)	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:651)	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:365)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:109)	at java.awt.WaitDispatchSupport$2.run(WaitDispatchSupport.java:184)	at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:229)	at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:227)	at java.security.AccessController.doPrivileged(Native Method)	at java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:227)	at java.awt.Dialog.show(Dialog.java:1084)	at com.intellij.openapi.ui.impl.DialogWrapperPeerImpl$MyDialog.show(DialogWrapperPeerImpl.java:735)	at com.intellij.openapi.ui.impl.DialogWrapperPeerImpl.show(DialogWrapperPeerImpl.java:457)	at com.intellij.openapi.ui.DialogWrapper.invokeShow(DialogWrapper.java:1688)	at com.intellij.openapi.ui.DialogWrapper.show(DialogWrapper.java:1637)	at com.intellij.openapi.vcs.changes.ui.CommitChangeListDialog.commitChanges(CommitChangeListDialog.java:216)	at com.intellij.openapi.vcs.changes.ui.CommitChangeListDialog.commitChanges(CommitChangeListDialog.java:184)	at com.intellij.openapi.vcs.changes.ui.CommitChangeListDialog.commitChanges(CommitChangeListDialog.java:173)	at com.intellij.openapi.vcs.changes.ui.CommitChangeListDialog.commitChanges(CommitChangeListDialog.java:152)	at com.intellij.openapi.vcs.changes.ui.CommitChangeListDialog.commitPaths(CommitChangeListDialog.java:143)	at com.intellij.openapi.vcs.actions.AbstractCommonCheckinAction.performCheckIn(AbstractCommonCheckinAction.java:69)	at com.intellij.openapi.vcs.actions.AbstractCommonCheckinAction.a(AbstractCommonCheckinAction.java:55)	at com.intellij.openapi.vcs.changes.Waiter.onSuccess(Waiter.java:65)	at com.intellij.openapi.progress.impl.CoreProgressManager.finishTask(CoreProgressManager.java:501)	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcessWithProgressSynchronously(CoreProgressManager.java:451)	at com.intellij.openapi.progress.impl.ProgressManagerImpl.runProcessWithProgressSynchronously(ProgressManagerImpl.java:89)	at com.intellij.openapi.progress.impl.CoreProgressManager$8.run(CoreProgressManager.java:351)	at com.intellij.openapi.progress.impl.CoreProgressManager.a(CoreProgressManager.java:355)	at com.intellij.openapi.progress.impl.CoreProgressManager.run(CoreProgressManager.java:334)	at com.intellij.openapi.vcs.changes.CallbackData.b(CallbackData.java:85)	at com.intellij.openapi.vcs.changes.UpdateRequestsQueue.invokeAfterUpdate(UpdateRequestsQueue.java:226)	at com.intellij.openapi.vcs.changes.ChangeListManagerImpl.invokeAfterUpdate(ChangeListManagerImpl.java:342)	at com.intellij.openapi.vcs.actions.AbstractCommonCheckinAction.actionPerformed(AbstractCommonCheckinAction.java:55)	at com.intellij.openapi.vcs.actions.AbstractVcsAction.actionPerformed(AbstractVcsAction.java:48)	at com.intellij.openapi.actionSystem.ex.ActionUtil$1.run(ActionUtil.java:208)	at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:224)	at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher$1.performAction(IdeKeyEventDispatcher.java:570)	at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.a(IdeKeyEventDispatcher.java:619)	at com.intellij.openapi.application.TransactionGuardImpl.performUserActivity(TransactionGuardImpl.java:202)	at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.processAction(IdeKeyEventDispatcher.java:618)	at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.d(IdeKeyEventDispatcher.java:477)	at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.dispatchKeyEvent(IdeKeyEventDispatcher.java:211)	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:633)	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:365)	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)