Can not create a group and new users

Good afternoon, colleagues. it is impossible to create a new group and user Pomoz exchange. When trying to select a unit search unit freezes. The logs an error. I do not understand that and what to do. Prompt please. Exchange 2013 and Windows server 2013.

Current user: 'Domain/Company/Emploees/TestUser'
Web service call 'https://exchange.domain:444/ecp/DDI/DDIService.svc/GetList?reqId=905048&schema=OrganizationalUnitPicker&msExchEcpCanary=VVsOZo1K90K_uKYTCFp2jYhxN2V-3dAIUvbEO3KxoMWlqNJV8dPZMZYp4YB7VQ88iXbFzoGR-sI.(https://exchange.domain.ru/ecp/DDI/DDIService.svc/GetList?reqId=905048&schema=OrganizationalUnitPicker&msExchEcpCanary=VVsOZo1K90K_uKYTCFp2jYhxN2V-3dAIUvbEO3KxoMWlqNJV8dPZMZYp4YB7VQ88iXbFzoGR-sI.)' failed with the following error:
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
   at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   at Microsoft.Exchange.Management.DDIService.OrganizationalUnitPickerService.BuildOUTree(DataTable dataTable)
   at Microsoft.Exchange.Management.DDIService.OrganizationalUnitPickerService.GetListPostAction(DataRow inputRow, DataTable dataTable, DataObjectStore store)
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at Microsoft.Exchange.Management.DDIService.Activity.DoPostRun(DataRow input, DataTable dataTable, DataObjectStore store, Type codeBehind)
   at Microsoft.Exchange.Management.DDIService.Workflow.Run(DataRow input, DataTable dataTable, DataObjectStore store, Type codeBehind, UpdateTableDelegate updateTableDelegate)
   at Microsoft.Exchange.Management.DDIService.WSListDataHandler.ExecuteCore(Workflow workflow)
   at Microsoft.Exchange.Management.DDIService.WSDataHandler.Execute()
   at Microsoft.Exchange.Management.DDIService.DDIServiceHelper.GetListCommon(DDIParameters filter, SortOptions sort, Boolean forGetProgress)
   at SyncInvokeGetList(Object , Object[] , Object[] )
   at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs)
   at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at Microsoft.Exchange.Management.DDIService.Activity.DoPostRun(DataRow input, DataTable dataTable, DataObjectStore store, Type codeBehind)
   at Microsoft.Exchange.Management.DDIService.Workflow.Run(DataRow input, DataTable dataTable, DataObjectStore store, Type codeBehind, UpdateTableDelegate updateTableDelegate)
   at Microsoft.Exchange.Management.DDIService.WSListDataHandler.ExecuteCore(Workflow workflow)
   at Microsoft.Exchange.Management.DDIService.WSDataHandler.Execute()
   at Microsoft.Exchange.Management.DDIService.DDIServiceHelper.GetListCommon(DDIParameters filter, SortOptions sort, Boolean forGetProgress)
   at SyncInvokeGetList(Object , Object[] , Object[] )
   at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs)
   at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)

System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
   at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   at Microsoft.Exchange.Management.DDIService.OrganizationalUnitPickerService.BuildOUTree(DataTable dataTable)
   at Microsoft.Exchange.Management.DDIService.OrganizationalUnitPickerService.GetListPostAction(DataRow inputRow, DataTable dataTable, DataObjectStore store)
   at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   at Microsoft.Exchange.Management.DDIService.OrganizationalUnitPickerService.BuildOUTree(DataTable dataTable)
   at Microsoft.Exchange.Management.DDIService.OrganizationalUnitPickerService.GetListPostAction(DataRow inputRow, DataTable dataTable, DataObjectStore store)