siemens NX 8.5 co-simulation with matlab error

[jonesmith]

Hi all

I am new user in Nx program and I am trying to connect Nx with Matlab

I followed tutorial video in youtube to do that

http://www.youtube.com/watch?v=qubI820GgfE

every thing works perfectly but when Itried to run "cosimlacion_Solution_1_Plant.m" function I got error

Undefined function or variable 'original_sys'.

Error in nx_client (line 46)
open_system(original_sys) ;

Error in cosimlacion_Solution_1_Plant (line 7)
nx_client;

I am using

Nx 8.5 64bit

matlab 2012b 64bit

windows 7 64bit

can any on help me !!!!!!

thanks all