Error while transforming XSLT to HTML

My application reads XML and transfors it to HTML using XSLT.  During the XSL transformation I get error.

Error Description - Attribute and namespace nodes cannot be added to the parent element after a text, comment, pi, or sub-element node has already been added.

Here is my XSLT 
********************************************************************
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
      <xsl:output method="xml" indent="yes"/>

      <xsl:template match="/">
            <xsl:apply-templates select="response"/>
      </xsl:template>

      <xsl:template match="response">
            <xsl:copy>
                  <xsl:copy-of select="@*"/>
                  <goals>
                        <xsl:apply-templates select="goals/goal[@achieved='yes']" mode="passed"/>
                        <xsl:apply-templates select="goals/goal[@achieved='no']" mode="failed"/>
                  </goals>
            </xsl:copy>
      </xsl:template>

      <xsl:template match="goal" mode="passed">
            <xsl:copy>
                  <xsl:copy-of select="@*"/>
                  <xsl:copy-of select="conditions"/>
                  <xsl:copy-of select="adjustments"/>
                  <products>
                        <xsl:apply-templates select="products/product">
                              <xsl:sort select="pricing/calcs/@adjusted_rate" order="descending" data-type="number"/>
                        </xsl:apply-templates>
                  </products>
            </xsl:copy>
      </xsl:template>

      <xsl:template match="goal" mode="failed">
            <xsl:copy>
                  <xsl:copy-of select="@*"/>
                  <xsl:copy-of select="returns"/>
            </xsl:copy>
      </xsl:template>

      <xsl:template match="product">
            <xsl:variable name="par_rate" select="@par_rate"/>
            <xsl:copy>
                  <xsl:copy-of select="@*"/>

                  <xsl:choose>
                        <xsl:when test="pricing[@rate=$par_rate]">
          <xsl:copy-of select="pricing[@rate=$par_rate]"/>
                              <xsl:attribute name="pricing-id"><xsl:value-of select="generate-id()"/></xsl:attribute>          
                        </xsl:when>
                        <xsl:when test="count(pricing[not(@*) and out_of_range]) = count(pricing)">
                              <pricing>
                                    <xsl:copy-of select="pricing[1]/calcs"/>
                                    <xsl:attribute name="pricing-id"><xsl:value-of select="generate-id()"/></xsl:attribute>
                                    <out_of_range/>
                              </pricing>
                        </xsl:when>
                        <xsl:when test="count(pricing[@rate=$par_rate]) = 0">
                              <xsl:for-each select="pricing[not(out_of_range)]">
                                    <xsl:copy>
                                          <xsl:copy-of select="@price"/>
                                          <xsl:attribute name="pricing-id"><xsl:value-of select="generate-id()"/></xsl:attribute>
                                          <xsl:copy-of select="calcs"/>
                                          <no_par/>
                                    </xsl:copy>
                              </xsl:for-each>
                        </xsl:when>
                  </xsl:choose>
            </xsl:copy>
      </xsl:template>
</xsl:stylesheet>

***********************************************************************
In this XSLT, if I replace section-1 below with section-2, then it doesnt give any error but it does not display attribute as pricing-id in the Transformed XSLT. Could you suggest anything to fix this issue?

Section-1
=========
<xsl:when test="pricing[@rate=$par_rate]">
          <xsl:copy-of select="pricing[@rate=$par_rate]"/>
                              <xsl:attribute name="pricing-id"><xsl:value-of select="generate-id()"/></xsl:attribute>          
                        </xsl:when>
Section-2
===========
<xsl:when test="pricing[@rate=$par_rate]">
<xsl:attribute name="pricing-id"><xsl:value-of select="generate-id()"/></xsl:attribute>  
      <xsl:copy-of select="pricing[@rate=$par_rate]"/>                                
</xsl:when>

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Geert BormansInformation ArchitectCommented:
your error is here I assume

                    <pricing>
                        <xsl:copy-of select="pricing[1]/calcs"/>
                        <xsl:attribute name="pricing-id"><xsl:value-of select="generate-id()"/></xsl:attribute>
                        <out_of_range/>
                    </pricing>

you need to switch the lines where you create the attribute and create the child node
attributes need to come first

                   <pricing>
                        <xsl:attribute name="pricing-id"><xsl:value-of select="generate-id()"/></xsl:attribute>
                        <xsl:copy-of select="pricing[1]/calcs"/>
                        <out_of_range/>
                    </pricing>

0

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