Android: NotificationManager cannot be resolved to a variable

please help me i'm new to android and i need to add notification sound to my alarms. where can i put the the notification sound? here is my code with notification but with error "NotificationManager cannot be resolved to a variable"

the app force closes now i dont know why please help, here is the log cat

10-02 06:03:38.785: W/dalvikvm(938): threadid=1: thread exiting with uncaught exception (group=0x40015560)
10-02 06:03:38.879: E/AndroidRuntime(938): FATAL EXCEPTION: main
10-02 06:03:38.879: E/AndroidRuntime(938): java.lang.IllegalArgumentException: contentView required: pkg=med.scheduler id=0 notification=Notification(vibrate=default,sound=content://settings/system/alarm_alert,defaults=0x2,flags=0x10)
10-02 06:03:38.879: E/AndroidRuntime(938): at android.os.Parcel.readException(Parcel.java:1326)
10-02 06:03:38.879: E/AndroidRuntime(938): at android.os.Parcel.readException(Parcel.java:1276)
10-02 06:03:38.879: E/AndroidRuntime(938): at android.app.INotificationManager$Stub$Proxy.enqueueNotificationWithTag(INotificationManager.java:274)
10-02 06:03:38.879: E/AndroidRuntime(938): at android.app.NotificationManager.notify(NotificationManager.java:111)
10-02 06:03:38.879: E/AndroidRuntime(938): at android.app.NotificationManager.notify(NotificationManager.java:91)
10-02 06:03:38.879: E/AndroidRuntime(938): at med.scheduler.Enter_med$7.onClick(Enter_med.java:260)
10-02 06:03:38.879: E/AndroidRuntime(938): at android.view.View.performClick(View.java:2485)
10-02 06:03:38.879: E/AndroidRuntime(938): at android.view.View$PerformClick.run(View.java:9080)
10-02 06:03:38.879: E/AndroidRuntime(938): at android.os.Handler.handleCallback(Handler.java:587)
10-02 06:03:38.879: E/AndroidRuntime(938): at android.os.Handler.dispatchMessage(Handler.java:92)
10-02 06:03:38.879: E/AndroidRuntime(938): at android.os.Looper.loop(Looper.java:123)
10-02 06:03:38.879: E/AndroidRuntime(938): at android.app.ActivityThread.main(ActivityThread.java:3683)
10-02 06:03:38.879: E/AndroidRuntime(938): at java.lang.reflect.Method.invokeNative(Native Method)
10-02 06:03:38.879: E/AndroidRuntime(938): at java.lang.reflect.Method.invoke(Method.java:507)
10-02 06:03:38.879: E/AndroidRuntime(938): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
10-02 06:03:38.879: E/AndroidRuntime(938): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
10-02 06:03:38.879: E/AndroidRuntime(938): at dalvik.system.NativeStart.main(Native Method)
10-02 06:03:43.855: I/Process(938): Sending signal. PID: 938 SIG: 9

     Intent alarmIntent = new Intent (Enter_med.this, MyAlarmService.class);

                   NotificationManager manager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);

                   PendingIntent pi = PendingIntent.getActivity(context, 0, alarmIntent, PendingIntent.FLAG_UPDATE_CURRENT);
                    Notification note = new Notification(R.drawable.ic_launcher, "Alarm", System.currentTimeMillis());
                    Uri alarmSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
                    if(alarmSound == null){
                        alarmSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE);
                        if(alarmSound == null){
                            alarmSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
                        }
                    }
                    note.sound = alarmSound;
                    note.defaults |= Notification.DEFAULT_VIBRATE;
                    note.flags |= Notification.FLAG_AUTO_CANCEL;
                    manager.notify(0, note);

                 //alarm1
                        PendingIntent pendingAlarmIntent = PendingIntent.getService(Enter_med.this, 0, alarmIntent, PendingIntent.FLAG_UPDATE_CURRENT);

                        AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);

                        Calendar AlarmCal = Calendar.getInstance();
                        AlarmCal.setTimeInMillis(System.currentTimeMillis());
                        AlarmCal.set(Calendar.HOUR_OF_DAY, pHour);
                        AlarmCal.set(Calendar.MINUTE, pMinute);
                        AlarmCal.set(Calendar.SECOND, 0);

                        alarmManager.set(AlarmManager.RTC_WAKEUP, AlarmCal.getTimeInMillis(), pendingAlarmIntent);