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java.lang.NullPointerException: 	at java.net.URL.(Unknown Source)	at java.net.URL.(Unknown Source)	at java.net.URL.(Unknown Source)	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(Unknown Source)	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startDTDEntity(Unknown Source)	at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.setInputSource(Unknown Source)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(Unknown Source)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(Unknown Source)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(Unknown Source)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)	at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)	at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)	at org.jdom.input.SAXBuilder.build(SAXBuilder.java:489)	at org.movsim.input.XmlReaderSimInput$1.run(XmlReaderSimInput.java:289)	at java.security.AccessController.doPrivileged(Native Method)	at org.movsim.input.XmlReaderSimInput.getDocument(XmlReaderSimInput.java:271)	at org.movsim.input.XmlReaderSimInput.readAndValidateXmlFromFileName(XmlReaderSimInput.java:241)	at org.movsim.input.XmlReaderSimInput.(XmlReaderSimInput.java:111)	at org.movsim.input.XmlReaderSimInput.parse(XmlReaderSimInput.java:77)	at org.movsim.simulator.Simulator.initialize(Simulator.java:112)	at org.movsim.simulator.Simulator.loadScenarioFromXml(Simulator.java:208)	at org.movsim.viewer.graphics.TrafficCanvas.setupTrafficScenario(TrafficCanvas.java:263)	at org.movsim.viewer.ui.AppFrame.(AppFrame.java:81)	at org.movsim.viewer.App.main(App.java:63)