arduino target for simulink

Hello Im trying to add (Arduino Uno) target in Simulink:

arduino.Prefs.setArduinoPath('c:\Program Files\arduino*arduino-0021*')
I setup everything but the problem is when Im trying to build demo_arduino_blink this error appear
The call to arduino_make_rtw_hook, during the after_make hook generated the following error:
Download failed. Check your serial connection and and run the command arduino.Prefs.getMcu to check you have specified the correct MCU.

The build process will terminate as a result.

Download failed. Check your serial connection and and run the command arduino.Prefs.getMcu to check you have specified the correct MCU.

when Im checking Mcu:

arduino.Prefs.getMcu

ans =

atmega328p

when Im checking the COM this is a result:
arduino.Prefs.setComPort('COM3');

arduino.Prefs.searchForComPort

ans =

''

Im using MacBook Pro Windows7 64bits
If anyone knows whats a problem please help me I have to finish this project for my graduation
THANX