[CMU Sphinx] Reconnaissance vocale Java : NullPointerException

J'ai un problème avec mon application Java de reconnaissance vocale elle pose problème à ce niveau.

Code:

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Etat du Recognizer READY
Etat du Microphone microphone
Vous pouvez parler ...... 
Exception in thread "main" java.lang.NullPointerException
	at edu.cmu.sphinx.frontend.feature.DeltasFeatureExtractor.computeNextFeature(DeltasFeatureExtractor.java:68)
	at edu.cmu.sphinx.frontend.feature.AbstractFeatureExtractor.computeFeature(AbstractFeatureExtractor.java:236)
	at edu.cmu.sphinx.frontend.feature.AbstractFeatureExtractor.computeFeatures(AbstractFeatureExtractor.java:223)
	at edu.cmu.sphinx.frontend.feature.AbstractFeatureExtractor.getData(AbstractFeatureExtractor.java:107)
	at edu.cmu.sphinx.frontend.FrontEnd.getData(FrontEnd.java:219)
	at edu.cmu.sphinx.decoder.scorer.SimpleAcousticScorer.getNextData(SimpleAcousticScorer.java:101)
	at edu.cmu.sphinx.decoder.scorer.SimpleAcousticScorer.startRecognition(SimpleAcousticScorer.java:129)
	at edu.cmu.sphinx.decoder.search.SimpleBreadthFirstSearchManager.startRecognition(SimpleBreadthFirstSearchManager.java:204)
	at edu.cmu.sphinx.decoder.Decoder.decode(Decoder.java:62)
	at edu.cmu.sphinx.recognizer.Recognizer.recognize(Recognizer.java:110)
	at edu.cmu.sphinx.recognizer.Recognizer.recognize(Recognizer.java:126)
	at Principale.VocaleMain.main(VocaleMain.java:66)

Et je ne sais que faire? Aidez-moi s'il vous plait