asciidoctor-fopub exception

Dear Gurus,

Need some help.

I have tried to use asciidoctor-pdf to convert my asciidoc file into pdf.  However,  as I needed footnotes, and I understand that footnote is still work in progress, I have no choice but to resort to the docbook tool chain for conversion to pdf.

I have downloaded the latest asciidoctor-fopub-master package.  And I tried converting the README.adoc to pdf with the following 2 commands:

asciidoctor -b docbook -d book -a data-uri! README.adoc

followed by

fopub README.xml

However, I got the following exceptions thrown.  Please kindly help how I could resolve this.
I am on Windows 10, and using JRE 1.8.0_181 and javac 1.7.0_65

Thank you very much for the time to read this message.
Best wishes,
Hwai-An

Error message below:

Nov 24, 2018 5:15:51 PM org.apache.fop.cli.InputHandler error
SEVERE: javax.xml.transform.TransformerException: Had IO Exception with stylesheet file: https://cdn.docbook.org/release/xsl/current/fo/docbook.xsl
Nov 24, 2018 5:15:51 PM org.apache.fop.cli.Main startFOP
SEVERE: Exception
org.apache.fop.apps.FOPException: javax.xml.transform.TransformerException: org.apache.xml.utils.WrappedRuntimeException: Could not find variable with the name of title.margin.left
javax.xml.transform.TransformerConfigurationException: javax.xml.transform.TransformerException: org.apache.xml.utils.WrappedRuntimeException: Could not find variable with the name of title.margin.left
        at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:300)
        at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:126)
        at org.apache.fop.cli.Main.startFOP(Main.java:186)
        at org.apache.fop.cli.Main.main(Main.java:217)
Caused by: javax.xml.transform.TransformerConfigurationException: javax.xml.transform.TransformerException: org.apache.xml.utils.WrappedRuntimeException: Could not find variable with the name of title.margin.left
        at org.apache.xalan.processor.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:959)
        at org.apache.xalan.processor.TransformerFactoryImpl.newTransformer(TransformerFactoryImpl.java:774)
        at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:281)
        ... 3 more
Caused by: javax.xml.transform.TransformerException: org.apache.xml.utils.WrappedRuntimeException: Could not find variable with the name of title.margin.left
        at org.apache.xalan.processor.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:950)
        ... 5 more
Caused by: org.apache.xml.utils.WrappedRuntimeException: Could not find variable with the name of title.margin.left
        at org.apache.xpath.operations.Variable.fixupVariables(Variable.java:146)
        at org.apache.xpath.XPath.fixupVariables(XPath.java:86)
        at org.apache.xalan.templates.ElemValueOf.compose(ElemValueOf.java:181)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:357)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:362)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:362)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:362)
        at org.apache.xalan.templates.StylesheetRoot.recompose(StylesheetRoot.java:337)
        at org.apache.xalan.processor.StylesheetHandler.endDocument(StylesheetHandler.java:468)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endDocument(AbstractSAXParser.java:745)
        at com.sun.org.apache.xerces.internal.xinclude.XIncludeHandler.endDocument(XIncludeHandler.java:1172)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:515)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
        at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:648)
        at org.apache.xalan.processor.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:920)
        ... 5 more

---------

javax.xml.transform.TransformerConfigurationException: javax.xml.transform.TransformerException: org.apache.xml.utils.WrappedRuntimeException: Could not find variable with the name of title.margin.left
        at org.apache.xalan.processor.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:959)
        at org.apache.xalan.processor.TransformerFactoryImpl.newTransformer(TransformerFactoryImpl.java:774)
        at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:281)
        at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:126)
        at org.apache.fop.cli.Main.startFOP(Main.java:186)
        at org.apache.fop.cli.Main.main(Main.java:217)
Caused by: javax.xml.transform.TransformerException: org.apache.xml.utils.WrappedRuntimeException: Could not find variable with the name of title.margin.left
        at org.apache.xalan.processor.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:950)
        ... 5 more
Caused by: org.apache.xml.utils.WrappedRuntimeException: Could not find variable with the name of title.margin.left
        at org.apache.xpath.operations.Variable.fixupVariables(Variable.java:146)
        at org.apache.xpath.XPath.fixupVariables(XPath.java:86)
        at org.apache.xalan.templates.ElemValueOf.compose(ElemValueOf.java:181)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:357)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:362)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:362)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:362)
        at org.apache.xalan.templates.StylesheetRoot.recompose(StylesheetRoot.java:337)
        at org.apache.xalan.processor.StylesheetHandler.endDocument(StylesheetHandler.java:468)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endDocument(AbstractSAXParser.java:745)
        at com.sun.org.apache.xerces.internal.xinclude.XIncludeHandler.endDocument(XIncludeHandler.java:1172)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:515)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
        at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:648)
        at org.apache.xalan.processor.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:920)
        ... 5 more
---------
javax.xml.transform.TransformerException: org.apache.xml.utils.WrappedRuntimeException: Could not find variable with the name of title.margin.left
        at org.apache.xalan.processor.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:950)
        at org.apache.xalan.processor.TransformerFactoryImpl.newTransformer(TransformerFactoryImpl.java:774)
        at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:281)
        at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:126)
        at org.apache.fop.cli.Main.startFOP(Main.java:186)
        at org.apache.fop.cli.Main.main(Main.java:217)
Caused by: org.apache.xml.utils.WrappedRuntimeException: Could not find variable with the name of title.margin.left
        at org.apache.xpath.operations.Variable.fixupVariables(Variable.java:146)
        at org.apache.xpath.XPath.fixupVariables(XPath.java:86)
        at org.apache.xalan.templates.ElemValueOf.compose(ElemValueOf.java:181)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:357)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:362)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:362)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:362)
        at org.apache.xalan.templates.StylesheetRoot.recompose(StylesheetRoot.java:337)
        at org.apache.xalan.processor.StylesheetHandler.endDocument(StylesheetHandler.java:468)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endDocument(AbstractSAXParser.java:745)
        at com.sun.org.apache.xerces.internal.xinclude.XIncludeHandler.endDocument(XIncludeHandler.java:1172)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:515)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
        at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:648)
        at org.apache.xalan.processor.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:920)
        ... 5 more
---------
org.apache.xml.utils.WrappedRuntimeException: Could not find variable with the name of title.margin.left
        at org.apache.xpath.operations.Variable.fixupVariables(Variable.java:146)
        at org.apache.xpath.XPath.fixupVariables(XPath.java:86)
        at org.apache.xalan.templates.ElemValueOf.compose(ElemValueOf.java:181)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:357)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:362)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:362)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:362)
        at org.apache.xalan.templates.StylesheetRoot.recompose(StylesheetRoot.java:337)
        at org.apache.xalan.processor.StylesheetHandler.endDocument(StylesheetHandler.java:468)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endDocument(AbstractSAXParser.java:745)
        at com.sun.org.apache.xerces.internal.xinclude.XIncludeHandler.endDocument(XIncludeHandler.java:1172)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:515)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
        at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:648)
        at org.apache.xalan.processor.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:920)
        at org.apache.xalan.processor.TransformerFactoryImpl.newTransformer(TransformerFactoryImpl.java:774)
        at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:281)
        at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:126)
        at org.apache.fop.cli.Main.startFOP(Main.java:186)
        at org.apache.fop.cli.Main.main(Main.java:217)
---------
; SystemID: file:///D:/bin/asciidoctor-fopub/build/fopub/docbook-xsl/fo-pdf.xsl; Line#: 247; Column#: 82
; SystemID: file:///D:/bin/asciidoctor-fopub/build/fopub/docbook-xsl/fo-pdf.xsl; Line#: 247; Column#: 82
javax.xml.transform.TransformerException: Could not find variable with the name of title.margin.left
        at org.apache.xpath.operations.Variable.fixupVariables(Variable.java:144)
        at org.apache.xpath.XPath.fixupVariables(XPath.java:86)
        at org.apache.xalan.templates.ElemValueOf.compose(ElemValueOf.java:181)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:357)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:362)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:362)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:362)
        at org.apache.xalan.templates.StylesheetRoot.recompose(StylesheetRoot.java:337)
        at org.apache.xalan.processor.StylesheetHandler.endDocument(StylesheetHandler.java:468)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endDocument(AbstractSAXParser.java:745)
        at com.sun.org.apache.xerces.internal.xinclude.XIncludeHandler.endDocument(XIncludeHandler.java:1172)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:515)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
        at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:648)
        at org.apache.xalan.processor.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:920)
        at org.apache.xalan.processor.TransformerFactoryImpl.newTransformer(TransformerFactoryImpl.java:774)
        at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:281)
        at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:126)
        at org.apache.fop.cli.Main.startFOP(Main.java:186)
        at org.apache.fop.cli.Main.main(Main.java:217)
---------
org.apache.xml.utils.WrappedRuntimeException: Could not find variable with the name of title.margin.left
        at org.apache.xpath.operations.Variable.fixupVariables(Variable.java:146)
        at org.apache.xpath.XPath.fixupVariables(XPath.java:86)
        at org.apache.xalan.templates.ElemValueOf.compose(ElemValueOf.java:181)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:357)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:362)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:362)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:362)
        at org.apache.xalan.templates.StylesheetRoot.recompose(StylesheetRoot.java:337)
        at org.apache.xalan.processor.StylesheetHandler.endDocument(StylesheetHandler.java:468)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endDocument(AbstractSAXParser.java:745)
        at com.sun.org.apache.xerces.internal.xinclude.XIncludeHandler.endDocument(XIncludeHandler.java:1172)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:515)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
        at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:648)
        at org.apache.xalan.processor.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:920)
        at org.apache.xalan.processor.TransformerFactoryImpl.newTransformer(TransformerFactoryImpl.java:774)
        at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:281)
        at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:126)
        at org.apache.fop.cli.Main.startFOP(Main.java:186)
        at org.apache.fop.cli.Main.main(Main.java:217)
---------
; SystemID: file:///D:/bin/asciidoctor-fopub/build/fopub/docbook-xsl/fo-pdf.xsl; Line#: 247; Column#: 82
; SystemID: file:///D:/bin/asciidoctor-fopub/build/fopub/docbook-xsl/fo-pdf.xsl; Line#: 247; Column#: 82
javax.xml.transform.TransformerException: Could not find variable with the name of title.margin.left
        at org.apache.xpath.operations.Variable.fixupVariables(Variable.java:144)
        at org.apache.xpath.XPath.fixupVariables(XPath.java:86)
        at org.apache.xalan.templates.ElemValueOf.compose(ElemValueOf.java:181)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:357)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:362)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:362)
        at org.apache.xalan.templates.StylesheetRoot.composeTemplates(StylesheetRoot.java:362)
        at org.apache.xalan.templates.StylesheetRoot.recompose(StylesheetRoot.java:337)
        at org.apache.xalan.processor.StylesheetHandler.endDocument(StylesheetHandler.java:468)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endDocument(AbstractSAXParser.java:745)
        at com.sun.org.apache.xerces.internal.xinclude.XIncludeHandler.endDocument(XIncludeHandler.java:1172)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:515)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
        at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:648)
        at org.apache.xalan.processor.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:920)
        at org.apache.xalan.processor.TransformerFactoryImpl.newTransformer(TransformerFactoryImpl.java:774)
        at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:281)
        at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:126)
        at org.apache.fop.cli.Main.startFOP(Main.java:186)
        at org.apache.fop.cli.Main.main(Main.java:217)

"Unsupported output type 'pdf'. Must be pdf, ps or fo."

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NAML

Dear Dan,

Thank you so much for your reply despite your busy schedule.

I managed to figure out the problem.  I was using Java version 7.  Somehow, that's causing the exception.  After I change to version 8, it is working fine now.

And thank you for making asciidoctor.  It is a very nice and valuable program.

Best regards,
Hwai An

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NAML