org.jdom2.input.JDOMParseException: Error on line 1 of document file:/iesl/canvas/ksilvers/eval/data/acl/full-pdfs/E09-1037.pdf: Content is not allowed in prolog.
	at org.jdom2.input.sax.SAXBuilderEngine.build(SAXBuilderEngine.java:228)
	at org.jdom2.input.sax.SAXBuilderEngine.build(SAXBuilderEngine.java:277)
	at org.jdom2.input.sax.SAXBuilderEngine.build(SAXBuilderEngine.java:264)
	at org.jdom2.input.SAXBuilder.build(SAXBuilder.java:1116)
	at edu.umass.cs.iesl.rpp.Main$.process(Main.scala:16)
	at edu.umass.cs.iesl.rpp.BatchMain$$anonfun$main$1.apply(BatchMain.scala:47)
	at edu.umass.cs.iesl.rpp.BatchMain$$anonfun$main$1.apply(BatchMain.scala:45)
	at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
	at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:186)
	at edu.umass.cs.iesl.rpp.BatchMain$.main(BatchMain.scala:45)
	at edu.umass.cs.iesl.rpp.BatchMain.main(BatchMain.scala)
Caused by: org.xml.sax.SAXParseException; systemId: file:/iesl/canvas/ksilvers/eval/data/acl/full-pdfs/E09-1037.pdf; lineNumber: 1; columnNumber: 1; Content is not allowed in prolog.
	at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:203)
	at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:177)
	at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:441)
	at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:368)
	at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1436)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:999)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606)
	at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:117)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
	at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:649)
	at org.jdom2.input.sax.SAXBuilderEngine.build(SAXBuilderEngine.java:217)
	... 10 more