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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

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java.lang.NullPointerException: 	at java.util.Hashtable.put(Hashtable.java:396)	at org.apache.tools.ant.PropertyHelper.setUserProperty(PropertyHelper.java:377)	at org.apache.tools.ant.Project.setUserProperty(Project.java:543)	at org.eclipse.ant.internal.core.ant.InternalAntRunner.setProperties(InternalAntRunner.java:232)	at org.eclipse.ant.internal.core.ant.InternalAntRunner.run(InternalAntRunner.java:553)	at org.eclipse.ant.internal.core.ant.InternalAntRunner.run(InternalAntRunner.java:455)	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 org.eclipse.ant.core.AntRunner.run(AntRunner.java:378)	at org.eclipse.pde.internal.core.exports.FeatureExportOperation.runScript(FeatureExportOperation.java:422)	at org.eclipse.pde.internal.core.exports.FeatureExportOperation.doExport(FeatureExportOperation.java:261)	at org.eclipse.pde.internal.core.exports.FeatureBasedExportOperation.run(FeatureBasedExportOperation.java:51)	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)