Compilation error when compiling PDF file: Variable 'sequence' has not been declared.

<?xml version='1.0'?>
<!-- $Id: myprint.xsl,v 1.20 2009/12/14 21:43:23 gabriela Exp $ -->
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns:fo="http://www.w3.org/1999/XSL/Format"
                xmlns:doc="http://nwalsh.com/xsl/documentation/1.0"
                exclude-result-prefixes="doc"
                version='1.0'>
 <xsl:import href="/home/docbook/docbook-xsl/fo/docbook.xsl"/>
 <xsl:import href="prn-titlepage.xsl"/>
 <xsl:import href="common.xsl"/>
 <xsl:import href="my-fo-article.xsl"/>
<!-- ==================================================================== -->
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<!-- ==================================================================== -->
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article toc,title,table
book toc,table,title
chapter title
part nop
</xsl:param>
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 <xsl:param name="body.margin.top">0.50in</xsl:param>
 <xsl:param name="body.start.indent">0pt</xsl:param>
 <xsl:param name="column.count.index" select="2" />
 <xsl:param name="column.gap.index" select="'12pt'"/>
 <xsl:param name="draft.mode">no</xsl:param>
 <xsl:param name="double.sided">1</xsl:param>
 <xsl:param name="footer.rule">0</xsl:param>
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 <xsl:param name="header.column.widths">1 3 1</xsl:param>
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<xsl:attribute-set name="monospace.properties">
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<xsl:attribute-set name="monospace.verbatim.properties">
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</xsl:attribute-set>
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 <xsl:param name="page.margin.top">0.75in</xsl:param>
 <xsl:param name="page.margin.inner">0.75in</xsl:param>
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 <!--
 <xsl:attribute-set name="normal.para.spacing">
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 </xsl:attribute-set>
 -->
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 <xsl:param name="default.table.width">100%</xsl:param>
 <xsl:param name="table.cell.border.color">gray</xsl:param>
 <xsl:param name="table.frame.border.color">gray</xsl:param>
 <xsl:attribute-set name="table.cell.padding">
  <xsl:attribute name="padding-left">3pt</xsl:attribute>
  <xsl:attribute name="padding-right">3pt</xsl:attribute>
  <xsl:attribute name="padding-top">2pt</xsl:attribute>
  <xsl:attribute name="padding-bottom">2pt</xsl:attribute>
 </xsl:attribute-set>
<!-- ==================================================================== -->
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 <xsl:param name="insert.olink.page.number">yes</xsl:param>
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 <xsl:attribute-set name="olink.properties">
  <xsl:attribute name="font-style">italic</xsl:attribute>
 </xsl:attribute-set>
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 <xsl:attribute-set name="xref.properties">
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 </xsl:attribute-set>
 <xsl:param name="xref.with.number.and.title">0</xsl:param>
<!-- ==================================================================== -->
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 <xsl:attribute-set name="itemizedlist.label.properties">
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 </xsl:attribute-set>
 <xsl:param name="itemizedlist.label.width">1.5em</xsl:param>
 <xsl:attribute-set name="list.block.spacing">
  <xsl:attribute name="space-before.optimum">0.5em</xsl:attribute>
  <xsl:attribute name="space-after.optimum">0.5em</xsl:attribute>
</xsl:attribute-set>
 <xsl:attribute-set name="list.item.spacing">
  <xsl:attribute name="space-before.optimum">0.25em</xsl:attribute>
  <xsl:attribute name="space-after.optimum">0.25em</xsl:attribute>
 </xsl:attribute-set>
 <xsl:attribute-set name="orderedlist.label.properties">
  <xsl:attribute name="text-align">center</xsl:attribute>
 </xsl:attribute-set>
 <xsl:param name="orderedlist.label.width">1.5em</xsl:param>
<!-- ==================================================================== -->
<!-- Q and A Set -->
 <xsl:param name="qandadiv.autolabel" select="1"/>
<!-- ==================================================================== -->
<!-- Miscellaneous-->
 <xsl:param name="abstract.notitle.enabled" select="1"></xsl:param>
 <xsl:param name="email.mailto.enabled" select="0"></xsl:param>
 <xsl:param name="ulink.show">0</xsl:param>
 <xsl:param name="use.svg">1</xsl:param>
 <xsl:param name="variablelist.as.blocks">1</xsl:param>
<!-- ==================================================================== -->
<!-- Property sets -->
 <xsl:attribute-set name="formal.object.properties">
  <xsl:attribute name="keep-together.within-column">auto</xsl:attribute>
 </xsl:attribute-set>
 <xsl:attribute-set name="formal.title.properties" 
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   <xsl:attribute name="font-weight">bold</xsl:attribute>
   <xsl:attribute name="font-size">9pt</xsl:attribute>
  <!-- <xsl:attribute name="hyphenate">false</xsl:attribute>
   <xsl:attribute name="space-after.minimum">0.4em</xsl:attribute>
   <xsl:attribute name="space-after.optimum">0.6em</xsl:attribute>
   <xsl:attribute name="space-after.maximum">0.8em</xsl:attribute>-->
 </xsl:attribute-set>
 <xsl:attribute-set name="index.title.properties">
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 <xsl:attribute-set name="section.level1.properties">
 <!--  <xsl:attribute name="break-before">page</xsl:attribute>-->
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 <xsl:attribute-set name="section.title.level1.properties">
  <xsl:attribute name="font-size">
   <xsl:value-of select="$body.font.master * 1.8"/>
   <xsl:text>pt</xsl:text>
  </xsl:attribute>
  <xsl:attribute name="space-before.minimum">0.4em</xsl:attribute>
  <xsl:attribute name="space-after.maximum">1.8em</xsl:attribute>
 </xsl:attribute-set>
 <xsl:attribute-set name="section.title.level2.properties">
  <xsl:attribute name="font-size">
   <xsl:value-of select="$body.font.master * 1.5"/>
   <xsl:text>pt</xsl:text>
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  <!-- <xsl:attribute name="space-before.minimum">1.0em</xsl:attribute>
      <xsl:attribute name="space-before.optimum">2.0em</xsl:attribute>-->
  <xsl:attribute name="space-after.maximum">1.5em</xsl:attribute>
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 <xsl:attribute-set name="section.title.level3.properties">
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   <xsl:text>pt</xsl:text>
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  <!--<xsl:attribute name="font-style">italic</xsl:attribute>-->
 </xsl:attribute-set>
 <xsl:attribute-set name="section.title.level4.properties">
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   <xsl:text>pt</xsl:text>
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 </xsl:attribute-set>
 <xsl:attribute-set name="section.title.level5.properties">
  <xsl:attribute name="font-size">
   <xsl:value-of select="$body.font.master * 1.3"/>
   <xsl:text>pt</xsl:text>
  </xsl:attribute>
 </xsl:attribute-set>
<!-- ==================================================================== -->
<!-- Captions -->
 <xsl:template match="caption">
  <fo:block start-indent="0.25in" end-indent=".5in">
      <xsl:attribute name="text-align">center</xsl:attribute>
      <xsl:attribute name="font-style">italic</xsl:attribute>
    <xsl:apply-templates/>
  </fo:block>
 </xsl:template>
<!-- ==================================================================== -->
 <xsl:template match="corpauthor" mode="article.titlepage.recto.mode">
  <!-- Insert corporate logo -->
  <fo:external-graphic src="url(../images/INRO-Logo-grayscale.svg)" content-height="0.25in"/>
 </xsl:template>
 <xsl:template match="corpauthor" mode="book.titlepage.recto.mode">
 </xsl:template>
<!-- ==================================================================== -->
 <!-- Equation numbering -->
 <xsl:template match="equation">
  <fo:table width="100%" table-layout="fixed">
    <xsl:attribute name="id">
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    </xsl:attribute>
    <fo:table-column column-width="90%"/>
    <fo:table-column column-width="10%"/>
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            <xsl:text>)</xsl:text>
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 </xsl:template>
<!-- ==================================================================== -->
<!-- General character and paragraph styles -->
 <xsl:template match="accel|classname|filename|function|literal|methodname">
   <xsl:call-template name="inline.monoseq"/>
 </xsl:template>
 <xsl:template match="emphasis[@role='blue']">
  <fo:inline color="royalblue"
             font-style="italic">
   <xsl:apply-templates/> 
  </fo:inline> 
 </xsl:template>
 <xsl:template match="emphasis[@role='green']">
  <fo:inline color="green"
             font-style="italic">
   <xsl:apply-templates/> 
  </fo:inline> 
 </xsl:template>
 <xsl:template match="emphasis[@role='cyan']">
  <fo:inline color="deepskyblue"
             font-style="italic">
   <xsl:apply-templates/> 
  </fo:inline> 
 </xsl:template>
 <xsl:template match="emphasis[@role='red']">
  <fo:inline color="red"
             font-style="italic">
   <xsl:apply-templates/> 
  </fo:inline> 
 </xsl:template>
 <xsl:template match="emphasis[@role='pink']">
  <fo:inline color="magenta"
             font-style="italic">
   <xsl:apply-templates/> 
  </fo:inline> 
 </xsl:template>
  <xsl:template match="emphasis[@role='purple']">
  <fo:inline color="#4b0082"
             font-style="italic">
   <xsl:apply-templates/>
  </fo:inline>
 </xsl:template>
  <xsl:template match="emphasis[@role='yellow']">
  <fo:inline color="#ffd700"
             font-style="italic">
   <xsl:apply-templates/>
  </fo:inline>
 </xsl:template>
 <xsl:template match="emphasis[@role='strong']|firstterm">
  <xsl:call-template name="inline.boldseq"/>
 </xsl:template>
 <xsl:template match="errortext|errorname">
  <xsl:call-template name="inline.italicseq"/>
 </xsl:template>
<!-- <xsl:template match="formalpara/para">
  <fo:block keep-with-next.within-column="always"></fo:block>
 </xsl:template>-->
 <xsl:template match="formalpara/title">
       <xsl:call-template name="inline.boldseq"/>
 </xsl:template>
 <xsl:template match="guibutton|guilabel|guimenu|guimenuitem|guisubmenu|application">
  <xsl:call-template name="inline.italicseq"/>
 </xsl:template>
 <xsl:template match="para[@role='indent']">
  <fo:block start-indent="0.75in" end-indent="0.75in">
   <xsl:apply-templates/>
  </fo:block>
 </xsl:template>
 <xsl:template match="para[@role='keep-with-next']">
  <fo:block keep-with-next.within-column="always">
   <xsl:apply-templates/>
  </fo:block>
 </xsl:template>
<xsl:attribute-set name="superscript.properties">
  <xsl:attribute name="font-size">65%</xsl:attribute>
  <xsl:attribute name="font-family">serif</xsl:attribute>
</xsl:attribute-set>
<xsl:attribute-set name="subscript.properties">
  <xsl:attribute name="font-size">65%</xsl:attribute>
  <xsl:attribute name="font-family">serif</xsl:attribute>
</xsl:attribute-set>
<!-- ==================================================================== -->
 <!-- Customizing bullets -->
 <xsl:template name="next.itemsymbol">
  <xsl:param name="itemsymbol" select="'default'"/>
  <xsl:choose>
   <!-- Alternate between disc and endash symbols -->
   <xsl:when test="$itemsymbol = 'disc'">endash</xsl:when>
   <xsl:otherwise>disc</xsl:otherwise>
  </xsl:choose>
 </xsl:template>
 <xsl:template match="processing-instruction('hard-pagebreak')">
   <fo:block break-after='page'/>
 </xsl:template>
<!-- ==================================================================== -->
 <!-- Math phrase formatting -->
 <xsl:template match="mathphrase">
  <fo:inline font-family="serif">
       <xsl:apply-templates/>
  </fo:inline>
 </xsl:template>
<!-- ==================================================================== -->
 <!-- Footer -->
 <xsl:template name="foot.sep.rule">
  <xsl:if test="$footer.rule != 0">
   <xsl:attribute name="border-top-width">medium</xsl:attribute>
   <xsl:attribute name="border-top-style">groove</xsl:attribute>
   <xsl:attribute name="border-top-color">gray</xsl:attribute>
  </xsl:if>
 </xsl:template>
 <xsl:template name="footer.content">
  <xsl:param name="pageclass"></xsl:param>
  <xsl:param name="sequence"></xsl:param>
  <xsl:param name="position"></xsl:param>
  <xsl:param name="gentext-key"></xsl:param>
  <xsl:if test="$pageclass != 'titlepage'">
   <xsl:choose>
    <xsl:when test="(($sequence='first' and $gentext-key='article')
    or $pageclass='mybook-titlepage')">
    <!-- nop; no footer on title pages and first page of an article -->
    </xsl:when>
    <xsl:when test="($sequence='odd' and $position='left') or
      ($sequence='even' and $position='right') or
      ($sequence='first' and $position='left')">
     <xsl:text>&#x00A9; INRO</xsl:text>
     <!-- <fo:external-graphic src="url(../images/INRO-Logo-grayscale.svg)" content-height="0.125in"/> -->
    </xsl:when>
    <xsl:when test="$position='center'">
    <!-- Include document title
     <xsl:apply-templates select="/*[1]" mode="object.title.markup"/>-->
    </xsl:when>
    <xsl:when test="($sequence='odd' and $position='right') or
      ($sequence='even' and $position='left') or
      ($sequence='first' and $position='right')">
     <fo:external-graphic src="url(../images/Emme-Logo-grayscale.svg)" content-height="0.1in"/>
    </xsl:when>
   </xsl:choose>
  </xsl:if>
 </xsl:template>
<!-- ==================================================================== -->
 <!-- Header -->
 <xsl:template name="header.content">
  <xsl:param name="pageclass"></xsl:param>
  <xsl:param name="sequence"></xsl:param>
  <xsl:param name="position"></xsl:param>
  <xsl:param name="gentext-key"></xsl:param>
  <xsl:if test="$pageclass != 'titlepage'">
   <xsl:choose>
    <xsl:when test="$pageclass='mybook-titlepage'">
    </xsl:when>
    <xsl:when test="($sequence='odd' and $position='left') or
      ($sequence='even' and $position='right')"></xsl:when>
    <xsl:when test="($sequence='even' and $position='center')">
     <xsl:apply-templates select="." mode="title.markup"/>
    </xsl:when>
    <xsl:when test="($sequence='odd' and $position='center')">
     <fo:retrieve-marker retrieve-class-name="section.head.marker"
                         retrieve-position="first-including-carryover"
                         retrieve-boundary="page-sequence"/>
    </xsl:when>
    <xsl:when test="($sequence='odd' and $position='right') or
      ($sequence='even' and $position='left') or
      ($sequence='first' and $pageclass='index' and $position='right') or
      ($sequence='first' and $pageclass='lot' and $position='right') or 
      ($sequence='first' and $pageclass='body' and $position='right') or 
      ($sequence='first' and $pageclass='back' and $position='right')">
     <fo:page-number/>
    </xsl:when>
   </xsl:choose>
  </xsl:if>
 </xsl:template>
 <xsl:template name="head.sep.rule">
  <xsl:if test="($header.rule != 0 and
                ($sequence!='first' or $pageclass='index')) or
                  ($header.rule !=0 and
                ($sequence!='first' or $pageclass='lot'))">
   <xsl:attribute name="border-bottom-width">medium</xsl:attribute>
   <xsl:attribute name="border-bottom-style">groove</xsl:attribute>
   <xsl:attribute name="border-bottom-color">gray</xsl:attribute>
  </xsl:if>
 </xsl:template>
<!-- ==================================================================== -->
<!-- Changes following aswer from Bob Staton to my question:
     Changing the printed area of a book title page -->
 <xsl:template name="select.user.pagemaster">
  <xsl:param name="element"/>
  <xsl:param name="pageclass"/>
  <xsl:param name="default-pagemaster"/>
  <!-- Return my customized title page master name if for titlepage,
       otherwise return the default. -->
  <xsl:choose>
   <xsl:when test="$default-pagemaster = 'titlepage'">
    <xsl:value-of select="'mybook-titlepage'" />
   </xsl:when>
   <xsl:otherwise>
    <xsl:value-of select="$default-pagemaster"/>
   </xsl:otherwise>
  </xsl:choose>
 </xsl:template>
<!-- ==================================================================== -->
 <!--Customized title page -->
 <xsl:template name="user.pagemasters">
  <fo:page-sequence-master master-name="mybook-titlepage">
   <fo:repeatable-page-master-alternatives>
    <fo:conditional-page-master-reference master-reference="blank"
                                              blank-or-not-blank="blank"/>
    <fo:conditional-page-master-reference master-reference="mybook-titlepage-first"
                                              page-position="first"/>
    <fo:conditional-page-master-reference master-reference="mybook-titlepage-odd"
                                              odd-or-even="odd"/>
    <fo:conditional-page-master-reference 
                                              odd-or-even="even">
     <xsl:attribute name="master-reference">
      <xsl:choose>
       <xsl:when test="$double.sided != 0">mybook-titlepage-even</xsl:when>
       <xsl:otherwise>mybook-titlepage-odd</xsl:otherwise>
      </xsl:choose>
     </xsl:attribute>
    </fo:conditional-page-master-reference>
   </fo:repeatable-page-master-alternatives>
  </fo:page-sequence-master>
  <fo:simple-page-master master-name="mybook-titlepage-first"
                           page-width="{$page.width}"
                           page-height="{$page.height}"
                           margin-top="0pt"
                           margin-bottom="0pt"
                           margin-left="0pt"
                           margin-right="0pt">
   <fo:region-body margin-bottom="0pt"
                      margin-top="0pt"
                      column-gap="{$column.gap.titlepage}"
                      column-count="{$column.count.titlepage}"></fo:region-body>
   <fo:region-before region-name="xsl-region-before-first"
                        extent="0pt"
                        display-align="before"/>
   <fo:region-after region-name="xsl-region-after-first"
                       extent="0pt"
                        display-align="after"/>
  </fo:simple-page-master>
  <fo:simple-page-master master-name="mybook-titlepage-odd"
                           page-width="{$page.width}"
                           page-height="{$page.height}"
                           margin-top="{$page.margin.top}"
                           margin-bottom="{$page.margin.bottom}"
                           margin-left="{$margin.left.inner}"
                           margin-right="{$page.margin.outer}">
   <fo:region-body margin-bottom="{$body.margin.bottom}"
                      margin-top="{$body.margin.top}"
                      column-gap="{$column.gap.titlepage}"
                      column-count="{$column.count.titlepage}"></fo:region-body>
   <fo:region-before region-name="xsl-region-before-odd"
                        extent="0pt"
                        display-align="before"/>
   <fo:region-after region-name="xsl-region-after-odd"
                       extent="0pt"
                        display-align="after"/>
  </fo:simple-page-master>
  <fo:simple-page-master master-name="mybook-titlepage-even"
                           page-width="{$page.width}"
                           page-height="{$page.height}"
                           margin-top="{$page.margin.top}"
                           margin-bottom="{$page.margin.bottom}"
                           margin-left="{$margin.left.outer}"
                           margin-right="{$page.margin.inner}">
   <fo:region-body margin-bottom="0pt"
                      margin-top="{$body.margin.top}"
                      column-gap="{$column.gap.titlepage}"
                      column-count="{$column.count.titlepage}"></fo:region-body>
   <fo:region-before region-name="xsl-region-before-even"
                        extent="0pt"
                        display-align="before"/>
   <fo:region-after region-name="xsl-region-after-even"
                       extent="0pt"
                        display-align="after"/>
  </fo:simple-page-master>
 </xsl:template>
<!-- ==================================================================== -->
</xsl:stylesheet>