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java.lang.NullPointerException: Attempt to invoke interface method 'org.w3c.dom.NodeList org.w3c.dom.Node.getChildNodes()' on a null object reference	at com.example.entwicklung1.designtestapp.ReadRssZander.ProcessXml(ReadRssZander.java:66)	at com.example.entwicklung1.designtestapp.ReadRssZander.doInBackground(ReadRssZander.java:58)	at com.example.entwicklung1.designtestapp.ReadRssZander.doInBackground(ReadRssZander.java:29)	at android.os.AsyncTask$2.call(AsyncTask.java:295)	at java.util.concurrent.FutureTask.run(FutureTask.java:237)