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java.lang.NullPointerException: 	at org.apache.ws.jaxme.xs.util.DTDParser.createAttribute(DTDParser.java:617)	at org.apache.ws.jaxme.xs.util.DTDParser.createElement(DTDParser.java:737)	at org.apache.ws.jaxme.xs.util.DTDParser.parse(DTDParser.java:761)	at org.apache.ws.jaxme.xs.util.DTDParser.parse(DTDParser.java:779)	at org.apache.ws.jaxme.generator.sg.impl.JAXBSchemaReader.parse(JAXBSchemaReader.java:129)	at org.apache.ws.jaxme.generator.impl.GeneratorImpl.generate(GeneratorImpl.java:125)	at org.apache.ws.jaxme.generator.impl.GeneratorImpl.generate(GeneratorImpl.java:154)	at org.apache.ws.jaxme.generator.XJCTask.execute(XJCTask.java:1004)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)	at org.apache.tools.ant.Task.perform(Task.java:364)	at org.apache.tools.ant.Target.execute(Target.java:341)	at org.apache.tools.ant.Target.performTasks(Target.java:369)	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)	at org.apache.tools.ant.Project.executeTarget(Project.java:1185)	at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40)	at org.apache.tools.ant.Project.executeTargets(Project.java:1068)	at org.apache.tools.ant.Main.runBuild(Main.java:668)	at org.apache.tools.ant.Main.startAnt(Main.java:187)	at org.apache.tools.ant.launch.Launcher.run(Launcher.java:246)	at org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at com.intellij.rt.ant.execution.AntMain2.main(AntMain2.java:17)