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    Take a look at this blog post on how to set up Grid2 https://goo.gl/rxzbE6. A user related (in the email group on the source) that using older selenium libs solves this exception.

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java.lang.NullPointerException: architecture	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:204)	at org.jclouds.ec2.domain.Image.(Image.java:81)	at org.jclouds.ec2.xml.DescribeImagesResponseHandler.endElement(DescribeImagesResponseHandler.java:169)	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:601)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1774)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2930)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807)	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107)	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)	at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)	at org.jclouds.http.functions.ParseSax.doParse(ParseSax.java:125)	at org.jclouds.http.functions.ParseSax.parse(ParseSax.java:114)	at org.jclouds.http.functions.ParseSax.apply(ParseSax.java:78)	at org.jclouds.http.functions.ParseSax.apply(ParseSax.java:51)	at com.google.common.util.concurrent.Futures$4.apply(Futures.java:477)	at com.google.common.util.concurrent.Futures$4.apply(Futures.java:475)	at com.google.common.util.concurrent.Futures$ChainingListenableFuture.run(Futures.java:826)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)	at java.lang.Thread.run(Thread.java:619)