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

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java.lang.NullPointerException:
at java.util.regex.Pattern.(Unknown Source)
at ru.runa.gpd.ui.custom.HighlightTextStyling$RegexpHighlight.(HighlightTextStyling.java:49)
at ru.runa.gpd.ui.custom.JavaHighlightTextStyling.(JavaHighlightTextStyling.java:38)
at ru.runa.gpd.extension.handler.GroovyActionHandlerProvider$ConfigurationDialog.createDialogFooter(GroovyActionHandlerProvider.java:70)
at ru.runa.gpd.extension.DelegableConfigurationDialog.createDialogArea(DelegableConfigurationDialog.java:47)
at org.eclipse.jface.dialogs.Dialog.createContents(Dialog.java:760)
at org.eclipse.jface.window.Window.create(Window.java:431)
at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1089)
at ru.runa.gpd.extension.DelegableProvider.showConfigurationDialog(DelegableProvider.java:27)
at ru.runa.gpd.property.DelegableConfPropertyDescriptor$DelegableCellEditor.openDialogBox(DelegableConfPropertyDescriptor.java:37)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:240)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494)
at ru.runa.gpd.Application.start(Application.java:16)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)

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