java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException: 	at org.hibernate.cfg.Configuration$MetadataSourceQueue.syncAnnotatedClasses(Configuration.java:3780)	at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1411)	at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1373)	at org.hibernate.envers.configuration.spi.AuditConfiguration.getFor(AuditConfiguration.java:183)	at org.hibernate.envers.configuration.spi.AuditConfiguration.getFor(AuditConfiguration.java:173)	at org.openxava.tools.SchemaTool.execute(SchemaTool.java:86)	at org.openxava.tools.SchemaTool.updateSchema(SchemaTool.java:54)	at org.openxava.tools.SchemaTool.main(SchemaTool.java:43)	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 org.apache.tools.ant.taskdefs.ExecuteJava.run(ExecuteJava.java:217)	at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:152)	at org.apache.tools.ant.taskdefs.Java.run(Java.java:771)	at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:221)	at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:135)	at org.apache.tools.ant.taskdefs.Java.execute(Java.java:108)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)	at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)	at org.apache.tools.ant.Task.perform(Task.java:348)	at org.apache.tools.ant.Target.execute(Target.java:435)	at org.apache.tools.ant.Target.performTasks(Target.java:456)	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1393)	at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:38)	at org.eclipse.ant.internal.launching.remote.EclipseSingleCheckExecutor.executeTargets(EclipseSingleCheckExecutor.java:34)	at org.apache.tools.ant.Project.executeTargets(Project.java:1248)	at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:440)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)	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 org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)	at org.apache.tools.ant.Task.perform(Task.java:348)	at org.apache.tools.ant.Target.execute(Target.java:435)	at org.apache.tools.ant.Target.performTasks(Target.java:456)	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1393)	at org.apache.tools.ant.Project.executeTarget(Project.java:1364)	at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)	at org.eclipse.ant.internal.launching.remote.EclipseDefaultExecutor.executeTargets(EclipseDefaultExecutor.java:36)	at org.apache.tools.ant.Project.executeTargets(Project.java:1248)	at org.eclipse.ant.internal.launching.remote.InternalAntRunner.run(InternalAntRunner.java:452)	at org.eclipse.ant.internal.launching.remote.InternalAntRunner.main(InternalAntRunner.java:139)