Stacktrace from online ODF validator; Calc likes the document just fine. What's wrong?

I’ve got no idea how to pursue this. The document appears to me to be valid. LibreOffice Calc opens it just fine. Excel complains. So I try the Online validator. Rather than telling me what, if anything is wrong, the validator dumps stack.

export.ods: Fatal: A qualified name was required, but ‘manifest’ was given! java.lang.IllegalArgumentException: A qualified name was required, but ‘manifest’ was given! at org.odftoolkit.odfdom.pkg.OdfNamespace.splitQName(OdfNamespace.java:142) at org.odftoolkit.odfdom.pkg.OdfNamespace.getPrefixPart(OdfNamespace.java:154) at org.odftoolkit.odfdom.pkg.OdfName.newName(OdfName.java:82) at org.odftoolkit.odfdom.pkg.OdfFileDom.createElementNS(OdfFileDom.java:298) at org.odftoolkit.odfdom.pkg.OdfFileSaxHandler.startElement(OdfFileSaxHandler.java:82) at org.odftoolkit.odfdom.pkg.rdfa.MultiContentHandler.startElement(MultiContentHandler.java:76) at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source) at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source) at org.apache.xerces.impl.XMLNSDocumentScannerImpl$NSContentDispatcher.scanRootElementHook(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XMLParser.parse(Unknown Source) at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source) at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source) at org.odftoolkit.odfdom.pkg.OdfFileDom.initialize(OdfFileDom.java:236) at org.odftoolkit.odfdom.pkg.OdfFileDom.initialize(OdfFileDom.java:212) at org.odftoolkit.odfdom.pkg.manifest.OdfManifestDom.initialize(OdfManifestDom.java:73) at org.odftoolkit.odfdom.pkg.OdfFileDom.(OdfFileDom.java:132) at org.odftoolkit.odfdom.pkg.manifest.OdfManifestDom.(OdfManifestDom.java:64) at org.odftoolkit.odfdom.pkg.OdfFileDom.newFileDom(OdfFileDom.java:194) at org.odftoolkit.odfdom.pkg.OdfPackage.parseManifest(OdfPackage.java:1313) at org.odftoolkit.odfdom.pkg.OdfPackage.readZip(OdfPackage.java:549) at org.odftoolkit.odfdom.pkg.OdfPackage.initializeZip(OdfPackage.java:519) at org.odftoolkit.odfdom.pkg.OdfPackage.(OdfPackage.java:328) at org.odftoolkit.odfdom.pkg.OdfPackage.loadPackage(OdfPackage.java:439) at org.odftoolkit.odfvalidator.ODFStreamValidator.getPackage(ODFStreamValidator.java:52) at org.odftoolkit.odfvalidator.ODFRootPackageValidator.getPackage(ODFRootPackageValidator.java:59) at org.odftoolkit.odfvalidator.ODFPackageValidator._validate(ODFPackageValidator.java:99) at org.odftoolkit.odfvalidator.ODFPackageValidator.validate(ODFPackageValidator.java:84) at org.odftoolkit.odfvalidator.ODFValidator.validateStream(ODFValidator.java:211) at org.apache.jsp.jsp.validate_jsp._jspService(validate_jsp.java:232) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:477) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329) at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:712) at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:580) at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:516) at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:955) at org.apache.jsp.jsp.index_jsp._jspService(index_jsp.java:128) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:477) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329) at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:688) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:367) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1639) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Thread.java:834)

If you can publish your document (or can create a redacted version that still makes the validator fail) then please submit a bug report at Issues · tdf/odftoolkit · GitHub and attach the document there.

Thanks! .