java.lang.NullPointerException

java.lang.NullPointerException at org.pmesmeur.sketchit.diagram.clazz.Finder.isTestFile(Finder.java:80) at org.pmesmeur.sketchit.diagram.clazz.Finder.computeManagedPsiClassesFromFiles(Finder.java:58) at org.pmesmeur.sketchit.diagram.clazz.Finder.findClasses(Finder.java:47) at org.pmesmeur.sketchit.diagram.clazz.Finder.<init>(Finder.java:27) at org.pmesmeur.sketchit.diagram.clazz.ClassDiagramGenerator.createListOfClassesToManage(ClassDiagramGenerator.java:120) at org.pmesmeur.sketchit.diagram.clazz.ClassDiagramGenerator.<init>(ClassDiagramGenerator.java:114) at org.pmesmeur.sketchit.diagram.clazz.ClassDiagramGenerator$Builder.build(ClassDiagramGenerator.java:97) at org.pmesmeur.sketchit.diagram.UmlModuleClassDiagram.generateDiagram(UmlModuleClassDiagram.java:45) at org.pmesmeur.sketchit.diagram.UmlDiagram.generateDiagram(UmlDiagram.java:56) at org.pmesmeur.sketchit.diagram.UmlDiagram.generate(UmlDiagram.java:35) at org.pmesmeur.sketchit.diagram.UmlDiagramsGenerator.generateModuleClassDiagram(UmlDiagramsGenerator.java:39) at org.pmesmeur.sketchit.diagram.UmlDiagramsGenerator.generateClassDiagrams(UmlDiagramsGenerator.java:30) at org.pmesmeur.sketchit.SketchIt.generatePlantUmlDiagram(SketchIt.java:59) at org.pmesmeur.sketchit.SketchIt.actionBody(SketchIt.java:46) at org.pmesmeur.sketchit.SketchIt.access$000(SketchIt.java:10) at org.pmesmeur.sketchit.SketchIt$1.run(SketchIt.java:33) at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:1054) at org.pmesmeur.sketchit.SketchIt.runInsideAnIntellijWriteAction(SketchIt.java:31) at org.pmesmeur.sketchit.SketchIt.actionPerformed(SketchIt.java:25) at com.intellij.openapi.actionSystem.ex.ActionUtil$1.run(ActionUtil.java:261) at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:278) at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.lambda$actionPerformed$0(ActionMenuItem.java:292) at com.intellij.openapi.wm.impl.FocusManagerImpl.runOnOwnContext(FocusManagerImpl.java:283) at com.intellij.openapi.wm.impl.IdeFocusManagerImpl.runOnOwnContext(IdeFocusManagerImpl.java:107) at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.actionPerformed(ActionMenuItem.java:282) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) at com.intellij.openapi.actionSystem.impl.ActionMenuItem.lambda$fireActionPerformed$0(ActionMenuItem.java:111) at com.intellij.openapi.application.TransactionGuardImpl.runSyncTransaction(TransactionGuardImpl.java:88) at com.intellij.openapi.application.TransactionGuardImpl.lambda$submitTransaction$1(TransactionGuardImpl.java:111) at com.intellij.openapi.application.TransactionGuardImpl.submitTransaction(TransactionGuardImpl.java:120) at com.intellij.openapi.application.TransactionGuard.submitTransaction(TransactionGuard.java:121) at com.intellij.openapi.actionSystem.impl.ActionMenuItem.fireActionPerformed(ActionMenuItem.java:111) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.JToggleButton$ToggleButtonModel.setPressed(JToggleButton.java:308) at javax.swing.AbstractButton.doClick(AbstractButton.java:376) at javax.swing.AbstractButton.doClick(AbstractButton.java:356) at com.intellij.openapi.wm.impl.GlobalMenuLinux.lambda$_handleEvent$13(GlobalMenuLinux.java:692) at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:315) at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.doRun(LaterInvocator.java:435) at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.runNextEvent(LaterInvocator.java:419) at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:403) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:764) at java.awt.EventQueue.access$500(EventQueue.java:98) at java.awt.EventQueue$3.run(EventQueue.java:715) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74) at java.awt.EventQueue.dispatchEvent(EventQueue.java:734) at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:729) at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:678) at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:373) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205) 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)

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