NullPointerException when I try to save something in DataRepository

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Hello everyone
I have problem.
When I try to save something from test site into DataRepository (some xpath element) i found this

error
error1439×815 91.9 KB

Also this is found in error.log

!ENTRY org.eclipse.e4.ui.workbench 4 0 2019-01-10 15:03:26.267
!MESSAGE 
!STACK 0
java.lang.NullPointerException
	at com.kms.katalon.dal.fileservice.manager.WebElementFileServiceManager.getAllChildren(WebElementFileServiceManager.java:225)
	at com.kms.katalon.dal.fileservice.manager.WebElementFileServiceManager.getAvailableWebElementName(WebElementFileServiceManager.java:114)
	at com.kms.katalon.dal.fileservice.dataprovider.WebElementFileServiceDataProvider.getAvailableWebElementName(WebElementFileServiceDataProvider.java:66)
	at com.kms.katalon.controller.ObjectRepositoryController.getAvailableWebElementName(ObjectRepositoryController.java:200)
	at com.kms.katalon.objectspy.util.WebElementUtils.convertWebElementToTestObject(WebElementUtils.java:400)
	at com.kms.katalon.objectspy.dialog.ObjectRepositoryService.createWebElementTree(ObjectRepositoryService.java:129)
	at com.kms.katalon.objectspy.dialog.ObjectRepositoryService.createNewObject(ObjectRepositoryService.java:96)
	at com.kms.katalon.objectspy.dialog.ObjectRepositoryService.addNonConflictedWebElement(ObjectRepositoryService.java:79)
	at com.kms.katalon.objectspy.dialog.ObjectRepositoryService.saveObject(ObjectRepositoryService.java:49)
	at com.kms.katalon.objectspy.dialog.NewObjectSpyDialog.addElementToObjectRepository(NewObjectSpyDialog.java:450)
	at com.kms.katalon.objectspy.dialog.NewObjectSpyDialog.access$8(NewObjectSpyDialog.java:441)
	at com.kms.katalon.objectspy.dialog.NewObjectSpyDialog$7.widgetSelected(NewObjectSpyDialog.java:331)
	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:249)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4418)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1079)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4236)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3824)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1121)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1022)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:150)
	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:693)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:610)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)
	at com.kms.katalon.core.application.Application.internalRunGUI(Application.java:120)
	at com.kms.katalon.core.application.Application.runGUI(Application.java:105)
	at com.kms.katalon.core.application.Application.start(Application.java:63)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:673)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:610)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1519)
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