Impossible to create Appointment using calendar WebService

{
   "id":false
  ,"title":"test"
  ,"location":false
  ,"TimeZone":"Etc/GMT+3"
  ,"start":"2017-01-20T20:30:03+03:00"
  ,"end":"2017-01-20T20:30:03+03:00"
  ,"description":"\u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0435"
  ,"owner":
      {
         "address":
               {
                   "country":"US"
                  ,"id":2
                  ,"email":"extuser@huntinglab.ru"
                  ,"deleted":false
               }
         ,"id":2
         ,"deleted":false
         ,"firstname":"External"
         ,"lastname":"User"
         ,"rights":["Soap","Login","Room","Dashboard"]
        ,"languageId":9
        ,"login":"extuser"
        ,"externalId":false
        ,"externalType":false,"type":"user"
      }
  ,"inserted":false
  ,"updated":false
  ,"deleted":false
  ,"reminder":false
  ,"room":
      {
           "id":4
          ,"name":"test24"
          ,"comment":"moderator user sergei"
          ,"type":"conference"
          ,"numberOfPartizipants":150
          ,"appointment":false
          ,"isPublic":true
          ,"demo":false
          ,"closed":false
          ,"externalId":10
          ,"externalType":"HuntingLabCMS"
          ,"redirectUrl":""
          ,"moderated":true
          ,"allowUserQuestions":true
          ,"allowRecording":false
          ,"waitForRecording":false
          ,"audioOnly":true
          ,"topBarHidden":false
          ,"chatHidden":false
          ,"activitiesHidden":false
          ,"filesExplorerHidden":false
          ,"actionsMenuHidden":false
          ,"screenSharingHidden":false
          ,"whiteboardHidden":false
       }
  ,"icalId":false
  ,"languageId":9
  ,"passwordProtected":false
  ,"connectedEvent":false
  ,"reminderEmailSend":false
}