[dbdoclet] Problem generating PDF

thanks to the great tutorial at
http://raibledesigns.com/wiki/Wiki.jsp?page=DocBook
I came accross DocBook and dbdoclet, but I am having problems with the
generation process.
Running the last part of the tutorial (fop with arguments) I get the stacktrace,
listed below.
Do you have any idea?
I am running on Windows XP, ant 1.6.5, FOP 0.20.5, dbdoclet 0_70_1,
JDK 1.5_06, ...
Thanks in advance,
Karsten.

Ant target:
        <target name="generatepdf" description="docbook target with dbdoclet"
depends="">
            <!-- === convert to pdf === -->
            <echo message="Converting to PDF"/>
            <java classname="org.apache.fop.apps.Fop"
                  failonerror="yes" dir="${dist.apidocs}" fork="yes">
              <classpath refid="dbdoclet.fop.classpath"/>
              <arg line="-xml reference-full.xml"/>
              <arg line="-xsl fo.xsl"/>
              <arg line="-pdf reference.pdf -d"/>
            </java>
        </target>

Erroroutput:

    [java] file:D:/dev/DocBook Doclet/docbook/xsl/common/l10n.xsl;
Line #95; Column #20; No localization exists for "en" or "". Using
default "en".
    [java] file:D:/dev/DocBook Doclet/docbook/xsl/common/l10n.xsl;
Line #95; Column #20; No localization exists for "en" or "". Using
default "en".
    [java] file:D:/dev/DocBook Doclet/docbook/xsl/common/l10n.xsl;
Line #175; Column #20; No "en" localization of "hyphenation-character"
exists.
    [java] file:D:/dev/DocBook Doclet/docbook/xsl/common/l10n.xsl;
Line #95; Column #20; No localization exists for "en" or "". Using
default "en".
    [java] [ERROR] java.lang.StringIndexOutOfBoundsException: String
index out of range: 0
    [java] file:D:/dev/DocBook Doclet/docbook/xsl/common/l10n.xsl;
Line #175; Column #20; No "en" localization of
"hyphenation-push-character-count" exists.
    [java] file:D:/dev/DocBook Doclet/docbook/xsl/common/l10n.xsl;
Line #95; Column #20; No localization exists for "en" or "". Using
default "en".
    [java] file:D:/dev/DocBook Doclet/docbook/xsl/common/l10n.xsl;
Line #175; Column #20; No "en" localization of
"hyphenation-remain-character-count" exists.
    [java] org.apache.fop.apps.FOPException:
java.lang.StringIndexOutOfBoundsException: String index out of range:
0
    [java] at 
org.apache.fop.apps.CommandLineStarter.run(CommandLineStarter.java:111)
    [java] at org.apache.fop.apps.Fop.main(Fop.java:62)
    [java] ---------
    [java] java.lang.RuntimeException:
java.lang.StringIndexOutOfBoundsException: String index out of range:
0
    [java] at 
org.apache.xalan.transformer.TransformerImpl.run(TransformerImpl.java:3407)
    [java] at 
org.apache.xalan.transformer.TransformerHandlerImpl.endDocument(TransformerHandlerImpl.java:433)
    [java] at org.apache.xerces.parsers.AbstractSAXParser.endDocument(Unknown
Source)
    [java] at org.apache.xerces.impl.dtd.XMLDTDValidator.endDocument(Unknown
Source)
    [java] at org.apache.xerces.impl.XMLDocumentScannerImpl.endEntity(Unknown
Source)
    [java] at org.apache.xerces.impl.XMLEntityManager.endEntity(Unknown Source)
    [java] at org.apache.xerces.impl.XMLEntityManager$EntityScanner.load(Unknown
Source)
    [java] at 
org.apache.xerces.impl.XMLEntityManager$EntityScanner.skipSpaces(Unknown
Source)
    [java] at 
org.apache.xerces.impl.XMLDocumentScannerImpl$TrailingMiscDispatcher.dispatch(Unknown
Source)
    [java] at 
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
Source)
    [java] at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
    [java] at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
    [java] at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
    [java] at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
    [java] at org.apache.xalan.transformer.TrAXFilter.parse(TrAXFilter.java:134)
    [java] at org.apache.fop.apps.Driver.render(Driver.java:498)
    [java] at 
org.apache.fop.apps.CommandLineStarter.run(CommandLineStarter.java:106)
    [java] at org.apache.fop.apps.Fop.main(Fop.java:62)
    [java] ---------
    [java] java.lang.RuntimeException:
java.lang.StringIndexOutOfBoundsException: String index out of range:
0
    [java] at 
org.apache.xalan.transformer.TransformerImpl.run(TransformerImpl.java:3407)
    [java] at 
org.apache.xalan.transformer.TransformerHandlerImpl.endDocument(TransformerHandlerImpl.java:433)
    [java] at org.apache.xerces.parsers.AbstractSAXParser.endDocument(Unknown
Source)
    [java] at org.apache.xerces.impl.dtd.XMLDTDValidator.endDocument(Unknown
Source)
    [java] at org.apache.xerces.impl.XMLDocumentScannerImpl.endEntity(Unknown
Source)
    [java] at org.apache.xerces.impl.XMLEntityManager.endEntity(Unknown Source)
    [java] at org.apache.xerces.impl.XMLEntityManager$EntityScanner.load(Unknown
Source)
    [java] at 
org.apache.xerces.impl.XMLEntityManager$EntityScanner.skipSpaces(Unknown
Source)
    [java] at 
org.apache.xerces.impl.XMLDocumentScannerImpl$TrailingMiscDispatcher.dispatch(Unknown
Source)
    [java] at 
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
Source)
    [java] at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
    [java] at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
    [java] at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
    [java] at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
    [java] at org.apache.xalan.transformer.TrAXFilter.parse(TrAXFilter.java:134)
    [java] at org.apache.fop.apps.Driver.render(Driver.java:498)
    [java] at 
org.apache.fop.apps.CommandLineStarter.run(CommandLineStarter.java:106)
    [java] at org.apache.fop.apps.Fop.main(Fop.java:62)

Other related posts: