[xsl] RuntimeException : Programmers's assertion from xsl transform

Hi all,

I am getting a run time error from an xsl transform, but I don't have a clue
what this means. Any help would be greatfully recieved. I've included part
of the code where I think the problem may lie.

"java.lang.RuntimeException: Programmer's assertion in getNextStepPos:
unknown stepType: -1"

Cheers

Simon

[code]
    <xsl:template name="image-layout-left-to-right">
        <xsl:param name="image-node-list" select="/.." />
        <xsl:param name="images-across" select="2" />
        <xsl:param name="start" select="1" />
        <xsl:param name="finish" select="$start + $images-across" />

        <xsl:variable name="row-start" select="&lt;tr&gt;" />
        <xsl:variable name="row-end" select="&lt;/tr&gt;" />

        <xsl:choose>
            <xsl:when test="$image-node-list">
                <xsl:if test="($finish - $start) = $images-across">
                    <xsl:value-of select="$row-start" />
                </xsl:if>
                <xsl:if test="$start = $finish">
                    <xsl:value-of select="$row-end" />
                </xsl:if>
                <xsl:if test="$start &lt; $finish">
                    <!-- Process the node at position() = $start -->
                    <td>
                        <xsl:if test="not($image-node-list[$start]/link)">
                            <a href="{$image-node-list[$start]/link}">
                        </xsl:if>
                            <img src="{$image-node-list[$start]/src"
                                 alt="{$image-node-list[$start]/alt"
                                 height="{$image-node-list[$start]/height"
                                 width="{$image-node-list[$start]/width"
                                 align="{$image-node-list[$start]/align"/>
                        <xsl:if test="not($image-node-list[$start]/link)">
                            </a>
                        </xsl:if>
                    </td>
                </xsl:if>

                <!-- Call the template again reajusting the required
parameters -->
                <xsl:call-template name="image-layout-left-to-right">
                    <xsl:with-param name="image-node-list">
                        <xsl:choose>
                            <xsl:when
test="$image-node-list[$start][position()] = last()">
                                <xsl:value-of select="/.." />
                            </xsl:when>
                            <xsl:otherwise>
                                <xsl:value-of select="$image-node-list" />
                            </xsl:otherwise>
                        </xsl:choose>
                    </xsl:with-param>
                    <xsl:with-param name="images-across"
select="$images-across" />
                    <xsl:with-param name="start" select="$start + 1" />
                    <xsl:with-param name="finish">
                        <xsl:choose>
                            <xsl:when test="$start = $finish">
                                <xsl:value-of select="$finish +
$images-across" />
                            </xsl:when>
                            <xsl:otherwise>
                                <xsl:value-of select="$finish" />
                            </xsl:otherwise>
                        </xsl:choose>
                    </xsl:with-param>
                </xsl:call-template>
            </xsl:when>
            <xsl:otherwise>
                <!-- Code to write packing cells -->
            </xsl:otherwise>
        </xsl:choose>
    </xsl:template>
[/code]

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