error in co-simulation Adams 2013/MATLAB2011Rb

Good evening, I have created a model with Adams and now I need to added a control for this model. So I have created 3 variables (1 actuator and 2 sensors). I have changed the current folder for matlab and launched the controls_plant_1.m file in matlab. Matlab has recognised the actuator and the sensors variables from adams but when I have wrote "adams_sys" in the matlab prompt I have got an error: Error using adams_sys (line 86) 'adams_sys_template' is an invalid model name or the file 'adams_sys_template.mdl' does not exist. What must I do? Thanks for any response.