java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.atlassw.tools.eclipse.checkstyle.config.CheckConfigurationFactory.exportConfiguration(CheckConfigurationFactory.java:255)
at com.atlassw.tools.eclipse.checkstyle.preferences.CheckstylePreferencePage.exportCheckstyleCheckConfig(CheckstylePreferencePage.java:926)
at com.atlassw.tools.eclipse.checkstyle.preferences.CheckstylePreferencePage.access$12(CheckstylePreferencePage.java:903)
at com.atlassw.tools.eclipse.checkstyle.preferences.CheckstylePreferencePage$PageController.widgetSelected(CheckstylePreferencePage.java:626)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:89)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:82)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:796)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:2773)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:668)
at org.eclipse.ui.internal.OpenPreferencesAction.run(OpenPreferencesAction.java:72)
at org.eclipse.jface.action.Action.runWithEvent(Action.java:881)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:915)
at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:866)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:82)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:796)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:2773)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1377)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1348)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:141)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:273)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.eclipse.core.launcher.Main.basicRun(Main.java:185)
at org.eclipse.core.launcher.Main.run(Main.java:704)

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