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java.lang.IllegalArgumentException: Argument cannot be null	at org.eclipse.swt.SWT.error(SWT.java:4263)	at org.eclipse.swt.SWT.error(SWT.java:4197)	at org.eclipse.swt.SWT.error(SWT.java:4168)	at org.eclipse.swt.widgets.Widget.error(Widget.java:468)	at org.eclipse.swt.widgets.Combo.add(Combo.java:154)	at ru.runa.gpd.ui.wizard.GlobalValidatorsWizardPage$GroovyParamsComposite.(GlobalValidatorsWizardPage.java:241)	at ru.runa.gpd.ui.wizard.GlobalValidatorsWizardPage$DefaultValidatorInfoControl.(GlobalValidatorsWizardPage.java:192)	at ru.runa.gpd.ui.wizard.GlobalValidatorsWizardPage.createControl(GlobalValidatorsWizardPage.java:164)	at org.eclipse.jface.wizard.Wizard.createPageControls(Wizard.java:174)	at ru.runa.gpd.ui.wizard.ValidatorWizard.createPageControls(ValidatorWizard.java:54)	at org.eclipse.jface.wizard.WizardDialog.createPageControls(WizardDialog.java:736)	at org.eclipse.jface.wizard.WizardDialog.createContents(WizardDialog.java:608)	at org.eclipse.jface.window.Window.create(Window.java:431)	at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1089)	at org.eclipse.jface.window.Window.open(Window.java:790)	at ru.runa.gpd.lang.action.OpenFormValidationDelegate.openValidationFile(OpenFormValidationDelegate.java:46)	at ru.runa.gpd.lang.action.OpenFormValidationDelegate.run(OpenFormValidationDelegate.java:37)	at org.eclipse.ui.internal.PluginAction.runWithEvent(PluginAction.java:251)	at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584)	at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501)	at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:411)	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.swt.widgets.Display.readAndDispatch(Display.java:3754)	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 org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)	at ru.runa.gpd.Application.start(Application.java:16)	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)	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 org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)	at org.eclipse.equinox.launcher.Main.run(Main.java:1410)