Exception : Cannot find the requested data item, such as a data key or value. ??

Question

hello guys how r u ?

my question is that, i am creating the speech recognition application but in my application
 
i created the Speech recognition object like

SpeechRecognitionEngine recognitionEngine = new SpeechRecgnitionEngine();

when "recognitionEngine.SetinputToDefaultAudioDevice();"  this line execute  the exception occur this

"Cannot find the requested data item, such as data key or value."


how can i get the solution about this ???

i hope i will get reply about this 


Thanks 


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