Exception in Speech Recognition with WPF .... " No audio device is installed " ?

hello guys how r u all ?

my question is that, i am creating speech recognition application, in that application i want to perform operation about  user will say any color name which showing in the listbox control  and that name of color will be show in the textbox, but when i run the application Exception is occured "No audio Device is installed."
kindly reply me with solution

Replyy Soonn

Thanks

application is attached  please find the attachment ...