My guestbook app was running fine until I upgraded to 1.2.6. Now I get
this error when I run it in Eclipse. Does anyone know how to fix this
problem:

[ERROR] Unable to start AppEngine server
com.google.apphosting.utils.config.AppEngineConfigException: Received
SAXException parsing the input stream.
        at
com.google.apphosting.utils.config.AppEngineWebXmlProcessor.getTopLevelNode
(AppEngineWebXmlProcessor.java:68)
        at
com.google.apphosting.utils.config.AppEngineWebXmlProcessor.processXml
(AppEngineWebXmlProcessor.java:39)
        at com.google.apphosting.utils.config.AppEngineWebXmlReader.processXml
(AppEngineWebXmlReader.java:94)
        at
com.google.apphosting.utils.config.AppEngineWebXmlReader.readAppEngineWebXml
(AppEngineWebXmlReader.java:61)
        at
com.google.appengine.tools.development.AbstractContainerService.loadAppEngineWebXml
(AbstractContainerService.java:201)
        at
com.google.appengine.tools.development.AbstractContainerService.startup
(AbstractContainerService.java:114)
        at com.google.appengine.tools.development.DevAppServerImpl.start
(DevAppServerImpl.java:218)
        at com.google.appengine.tools.development.gwt.AppEngineLauncher.start
(AppEngineLauncher.java:86)
        at com.google.gwt.dev.HostedMode.doStartUpServer(HostedMode.java:365)
        at com.google.gwt.dev.HostedModeBase.startUp(HostedModeBase.java:589)
        at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:397)
        at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)
Caused by: org.xml.sax.SAXParseException: The processing instruction
target matching "[xX][mM][lL]" is not allowed.
        at
com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException
(ErrorHandlerWrapper.java:195)
        at
com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError
(ErrorHandlerWrapper.java:174)
        at
com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError
(XMLErrorReporter.java:388)
        at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError
(XMLScanner.java:1414)
        at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanPIData
(XMLScanner.java:701)
        at
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanPIData
(XMLDocumentFragmentScannerImpl.java:1016)
        at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanPI
(XMLScanner.java:669)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl
$PrologDriver.next(XMLDocumentScannerImpl.java:954)
        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 javax.xml.parsers.SAXParser.parse(SAXParser.java:395)
        at org.mortbay.xml.XmlParser.parse(XmlParser.java:230)
        at
com.google.apphosting.utils.config.AppEngineWebXmlProcessor.getTopLevelNode
(AppEngineWebXmlProcessor.java:60)
        at
com.google.apphosting.utils.config.AppEngineWebXmlProcessor.processXml
(AppEngineWebXmlProcessor.java:39)
        at com.google.apphosting.utils.config.AppEngineWebXmlReader.processXml
(AppEngineWebXmlReader.java:94)
        at
com.google.apphosting.utils.config.AppEngineWebXmlReader.readAppEngineWebXml
(AppEngineWebXmlReader.java:61)
        at
com.google.appengine.tools.development.AbstractContainerService.loadAppEngineWebXml
(AbstractContainerService.java:201)
        at
com.google.appengine.tools.development.AbstractContainerService.startup
(AbstractContainerService.java:114)
        at com.google.appengine.tools.development.DevAppServerImpl.start
(DevAppServerImpl.java:218)
        at com.google.appengine.tools.development.gwt.AppEngineLauncher.start
(AppEngineLauncher.java:86)
        at com.google.gwt.dev.HostedMode.doStartUpServer(HostedMode.java:365)
        at com.google.gwt.dev.HostedModeBase.startUp(HostedModeBase.java:589)
        at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:397)
        at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)

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