Exception in thread "main" java.lang.NullPointerException
at edu.stanford.nlp.semgraph.SemanticGraph.removeEdge(SemanticGraph.java:122)
at edu.stanford.nlp.trees.UniversalEnglishGrammaticalStructure.expandPPConjunction(UniversalEnglishGrammaticalStructure.java:553)
at edu.stanford.nlp.trees.UniversalEnglishGrammaticalStructure.expandPPConjunctions(UniversalEnglishGrammaticalStructure.java:508)
at edu.stanford.nlp.trees.UniversalEnglishGrammaticalStructure.collapseDependencies(UniversalEnglishGrammaticalStructure.java:807)
at edu.stanford.nlp.trees.GrammaticalStructure.typedDependenciesCollapsed(GrammaticalStructure.java:877)
at edu.stanford.nlp.semgraph.SemanticGraphFactory.makeFromTree(SemanticGraphFactory.java:188)
at edu.stanford.nlp.semgraph.SemanticGraphFactory.generateCollapsedDependencies(SemanticGraphFactory.java:90)
at edu.stanford.nlp.pipeline.ParserAnnotatorUtils.fillInParseAnnotations(ParserAnnotatorUtils.java:51)
at edu.stanford.nlp.pipeline.ParserAnnotator.finishSentence(ParserAnnotator.java:266)
at edu.stanford.nlp.pipeline.ParserAnnotator.doOneSentence(ParserAnnotator.java:245)
at edu.stanford.nlp.pipeline.SentenceAnnotator.annotate(SentenceAnnotator.java:96)
at edu.stanford.nlp.pipeline.AnnotationPipeline.annotate(AnnotationPipeline.java:68)
at edu.stanford.nlp.pipeline.StanfordCoreNLP.annotate(StanfordCoreNLP.java:412)
at epubReader.Test.main(Test.java:68)

"Generally speaking, he was a scout, and rarely stood at a watch nearer than the four hundred and fiftieth metre, and then only as a cordon commander."