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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.Label.setText(Label.java:387)	at ru.runa.gpd.extension.handler.ParamDefComposite.addTextField(ParamDefComposite.java:119)	at ru.runa.gpd.extension.handler.ParamDefComposite.createUI(ParamDefComposite.java:77)	at ru.runa.gpd.extension.handler.ParamBasedProvider$ConfigurationWizardPage.createControl(ParamBasedProvider.java:129)	at org.eclipse.jface.wizard.Wizard.createPageControls(Wizard.java:174)	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.extension.handler.ParamBasedProvider.showConfigurationDialog(ParamBasedProvider.java:66)	at ru.runa.gpd.extension.handler.ParamBasedProvider.showConfigurationDialog(ParamBasedProvider.java:45)	at ru.runa.gpd.util.BotTaskUtils.editBotTaskLinkConfiguration(BotTaskUtils.java:179)	at ru.runa.gpd.lang.action.BotTaskActionsDelegate.linkWithBotTask(BotTaskActionsDelegate.java:139)	at ru.runa.gpd.lang.action.BotTaskActionsDelegate.access$1(BotTaskActionsDelegate.java:136)	at ru.runa.gpd.lang.action.BotTaskActionsDelegate$EditBotTaskWithNodeAction.run(BotTaskActionsDelegate.java:102)