couldn't open twain device. check cables.

hay guys i use matlab to acces my scanner using CMD TWAIN. for a while i use it properly but now i can't use my cmd twain and got notif like that. how to solved it?? i have check the cbale and it's normal but still got that warnning. please help me to solve it.

http://www.gssezisoft.com/main/cmdtwain-download/