NullPointerException in org.xmlvm.proc.XmlvmResource

java -jar xmlvm.jar --in=out --out=out --target=exe
Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.simontuffs.onejar.Boot.run(Boot.java:306)
at com.simontuffs.onejar.Boot.main(Boot.java:159)
Caused by: java.lang.NullPointerException
at org.xmlvm.proc.XmlvmResource.<init>(XmlvmResource.java:716)
at org.xmlvm.proc.out.XmlvmToXmlvmProcess.processPhase1(XmlvmToXmlvmProcess.java:62)
at org.xmlvm.proc.XmlvmProcessImpl.forwardOrProcessPhase1(XmlvmProcessImpl.java:209)
at org.xmlvm.proc.XmlvmProcessImpl.forwardOrProcessPhase1(XmlvmProcessImpl.java:206)
at org.xmlvm.proc.XmlvmProcessor.process(XmlvmProcessor.java:157)
at org.xmlvm.proc.XmlvmProcessor.process(XmlvmProcessor.java:137)
at org.xmlvm.Main.main(Main.java:53)
... 6 more