java.lang.NullPointerException

[nanusl]

java.lang.NullPointerException
at io.t28.json2java.idea.setting.Json2JavaConfigurable.(Json2JavaConfigurable.java:85)
at io.t28.json2java.idea.setting.Json2JavaConfigurable.(Json2JavaConfigurable.java:79)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.picocontainer.defaults.InstantiatingComponentAdapter.newInstance(InstantiatingComponentAdapter.java:193)
at com.intellij.util.pico.CachingConstructorInjectionComponentAdapter.doGetComponentInstance(CachingConstructorInjectionComponentAdapter.java:99)
at com.intellij.util.pico.CachingConstructorInjectionComponentAdapter.instantiateGuarded(CachingConstructorInjectionComponentAdapter.java:76)
at com.intellij.util.pico.CachingConstructorInjectionComponentAdapter.getComponentInstance(CachingConstructorInjectionComponentAdapter.java:59)
at com.intellij.openapi.extensions.AbstractExtensionPointBean.instantiate(AbstractExtensionPointBean.java:80)
at com.intellij.openapi.options.ConfigurableEP$ClassProducer.createElement(ConfigurableEP.java:334)
at com.intellij.openapi.options.ConfigurableEP.createConfigurable(ConfigurableEP.java:260)
at com.intellij.openapi.options.ex.ConfigurableWrapper.createConfigurable(ConfigurableWrapper.java:57)
at com.intellij.openapi.options.ex.ConfigurableWrapper.getConfigurable(ConfigurableWrapper.java:116)
at com.intellij.openapi.options.ex.ConfigurableWrapper.cast(ConfigurableWrapper.java:97)
at com.intellij.openapi.options.ex.ConfigurableWrapper.getDisplayName(ConfigurableWrapper.java:137)
at com.intellij.openapi.options.ex.Weighted.lambda$static$0(Weighted.java:35)
at java.util.TimSort.countRunAndMakeAscending(TimSort.java:360)
at java.util.TimSort.sort(TimSort.java:220)
at java.util.Arrays.sort(Arrays.java:1512)
at java.util.ArrayList.sort(ArrayList.java:1456)
at java.util.Collections.sort(Collections.java:175)
at com.intellij.openapi.options.ex.SortedConfigurableGroup.buildConfigurables(SortedConfigurableGroup.java:53)
at com.intellij.openapi.options.SearchableConfigurable$Parent$Abstract.getConfigurables(SearchableConfigurable.java:94)
at com.intellij.openapi.options.newEditor.SettingsTreeView.prepareProject(SettingsTreeView.java:302)
at com.intellij.openapi.options.newEditor.SettingsTreeView.access$1300(SettingsTreeView.java:58)
at com.intellij.openapi.options.newEditor.SettingsTreeView$MyNode.(SettingsTreeView.java:474)
at com.intellij.openapi.options.newEditor.SettingsTreeView$MyNode.(SettingsTreeView.java:467)
at com.intellij.openapi.options.newEditor.SettingsTreeView$MyRoot.buildChildren(SettingsTreeView.java:460)
at com.intellij.ui.treeStructure.CachingSimpleNode.getChildren(CachingSimpleNode.java:36)
at com.intellij.ui.treeStructure.SimpleTreeStructure.getChildElements(SimpleTreeStructure.java:25)
at com.intellij.ui.treeStructure.filtered.FilteringTreeStructure.addToCache(FilteringTreeStructure.java:66)
at com.intellij.ui.treeStructure.filtered.FilteringTreeStructure.rebuild(FilteringTreeStructure.java:61)
at com.intellij.ui.treeStructure.filtered.FilteringTreeStructure.(FilteringTreeStructure.java:53)
at com.intellij.ui.treeStructure.filtered.FilteringTreeStructure.(FilteringTreeStructure.java:44)
at com.intellij.ui.treeStructure.filtered.FilteringTreeBuilder.(FilteringTreeBuilder.java:53)
at com.intellij.openapi.options.newEditor.SettingsTreeView$MyBuilder.(SettingsTreeView.java:818)
at com.intellij.openapi.options.newEditor.SettingsTreeView.(SettingsTreeView.java:181)
at com.intellij.openapi.options.newEditor.SettingsDialog.treeViewFactory(SettingsDialog.java:67)
at com.intellij.openapi.options.newEditor.SettingsEditor.(SettingsEditor.java:150)
at com.intellij.openapi.options.newEditor.SettingsDialog.(SettingsDialog.java:61)
at com.intellij.openapi.options.newEditor.SettingsDialogFactory.create(SettingsDialogFactory.java:41)
at com.intellij.ide.actions.ShowSettingsUtilImpl.getDialog(ShowSettingsUtilImpl.java:57)
at com.intellij.ide.actions.ShowSettingsUtilImpl.showSettingsDialog(ShowSettingsUtilImpl.java:97)
at com.intellij.ide.actions.TemplateProjectPropertiesAction.actionPerformed(TemplateProjectPropertiesAction.java:38)
at com.intellij.openapi.actionSystem.ex.ActionUtil$1.run(ActionUtil.java:220)
at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:237)
at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.lambda$actionPerformed$0(ActionMenuItem.java:304)
at com.intellij.openapi.wm.impl.FocusManagerImpl.runOnOwnContext(FocusManagerImpl.java:307)
at com.intellij.openapi.wm.impl.IdeFocusManagerImpl.runOnOwnContext(IdeFocusManagerImpl.java:106)
at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.actionPerformed(ActionMenuItem.java:294)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at com.intellij.openapi.actionSystem.impl.ActionMenuItem.lambda$fireActionPerformed$0(ActionMenuItem.java:114)
at com.intellij.openapi.application.TransactionGuardImpl.runSyncTransaction(TransactionGuardImpl.java:88)
at com.intellij.openapi.application.TransactionGuardImpl.lambda$submitTransaction$1(TransactionGuardImpl.java:111)
at com.intellij.openapi.application.TransactionGuardImpl.submitTransaction(TransactionGuardImpl.java:120)
at com.intellij.openapi.application.TransactionGuard.submitTransaction(TransactionGuard.java:122)
at com.intellij.openapi.actionSystem.impl.ActionMenuItem.fireActionPerformed(ActionMenuItem.java:114)
at com.intellij.ui.plaf.beg.BegMenuItemUI.doClick(BegMenuItemUI.java:529)
at com.intellij.ui.plaf.beg.BegMenuItemUI.access$300(BegMenuItemUI.java:49)
at com.intellij.ui.plaf.beg.BegMenuItemUI$MyMouseInputHandler.mouseReleased(BegMenuItemUI.java:549)
at java.awt.Component.processMouseEvent(Component.java:6548)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3325)
at java.awt.Component.processEvent(Component.java:6313)
at java.awt.Container.processEvent(Container.java:2237)
at java.awt.Component.dispatchEventImpl(Component.java:4903)
at java.awt.Container.dispatchEventImpl(Container.java:2295)
at java.awt.Component.dispatchEvent(Component.java:4725)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4889)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4526)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4467)
at java.awt.Container.dispatchEventImpl(Container.java:2281)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4725)
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:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue$4.run(EventQueue.java:737)
at java.awt.EventQueue$4.run(EventQueue.java:735)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:734)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:781)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:718)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:382)
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)

idea version: 2018.2.2