You can download the zip file from this URL: 

http://www.mathworks.com/matlabcentral/fileexchange/26706-active-shape-model--asm--and-active-appearance-model--aam-/content/ASM_2D_example.m

Once you unzipped the files, follow the instructions detailed in the web page. You should execute the script with no problems. 

Try,

Good luck 

Alessandro

Please visit this link:

https://www.researchgate.net/post/How_can_I_build_an_active_shape_model_using_matlab

Please visit the link:

http://www.mathworks.com/matlabcentral/fileexchange/26706-active-shape-model--asm--and-active-appearance-model--aam-

Dear Huthaifa Abuhammad,

Look the link. May be useful.

http://www.itu.dk/people/vedrana/reports/AAM_Report.pdf

Regards, Shafagat