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java.lang.NullPointerException: 	at edu.cmu.sphinx.linguist.lextree.HMMNode.getBaseUnit(HMMTree.java:494)	at edu.cmu.sphinx.linguist.lextree.HMMNode.(HMMTree.java:472)	at edu.cmu.sphinx.linguist.lextree.Node.addSuccessor(HMMTree.java:164)	at edu.cmu.sphinx.linguist.lextree.HMMTree$EntryPoint.createEntryPointMap(HMMTree.java:1154)	at edu.cmu.sphinx.linguist.lextree.HMMTree$EntryPointTable.createEntryPointMaps(HMMTree.java:1012)	at edu.cmu.sphinx.linguist.lextree.HMMTree.compile(HMMTree.java:784)	at edu.cmu.sphinx.linguist.lextree.HMMTree.(HMMTree.java:706)	at edu.cmu.sphinx.linguist.lextree.LexTreeLinguist.generateHmmTree(LexTreeLinguist.java:428)	at edu.cmu.sphinx.linguist.lextree.LexTreeLinguist.compileGrammar(LexTreeLinguist.java:416)	at edu.cmu.sphinx.linguist.lextree.LexTreeLinguist.allocate(LexTreeLinguist.java:335)	at edu.cmu.sphinx.decoder.search.WordPruningBreadthFirstSearchManager.allocate(WordPruningBreadthFirstSearchManager.java:243)	at edu.cmu.sphinx.decoder.AbstractDecoder.allocate(AbstractDecoder.java:103)	at edu.cmu.sphinx.recognizer.Recognizer.allocate(Recognizer.java:164)	at edu.cmu.sphinx.api.StreamSpeechRecognizer.startRecognition(StreamSpeechRecognizer.java:52)	at edu.cmu.sphinx.api.StreamSpeechRecognizer.startRecognition(StreamSpeechRecognizer.java:39)