}).catch((error) => {
   refresher.cancel();
   var alert = Alert.create({
     title: 'Ошибка!',
     message: 'Невозможно обновить данные рабочего стола.',
     buttons: ['OK']
   })
   this.nav.present(alert);
 })

 this.getGroups(() => {
   if(refresher) {
     refresher.complete();
   }
 },true);

 this.schoolService.getMySchoolStudents().finally(() => {
   refresher ? refresher.complete() : null;
 }).subscribe(

 setTimeout(() => {
   for (var i = 0; i < data.length; i++) {
     items.unshift(data[i]);
   }
   refresher.complete();
 }, 1000);

 this.userService.getMyProfile().finally(() => {
   refresher ? refresher.complete() : null;
   this.ionicService.removeLoading();
 }).subscribe(

 .catch(() => refresher.complete());

 this.getSounds(() => {
     if(refresher) {
         refresher.complete();
     }
 },true);