problem in interfacing matlab 13 & arduino. uno

i have installed matlab support package on arduino

and arduino support package on matlab

after that, i hv used code

s=serial('COM3'); fopen(s); fprintf(s);

a=arduino('COM3'); a.pinMode(13,OUTPUT); a.digitalWrite(13,0); pause(2); a.digitalWrite(13,1);

but it is giving error in fopen