XSLT sort element doesn't work

I am trying to sort all the actor names displayed in a list. There must be something simple that I'm missing but I just can't figure out what it is.

<xsl:key name="kName" match="actor/name" use="." /><xsl:template match="/"><xsl:element name="html"><xsl:element name="head"><xsl:element name="title"><xsl:text>Actors list</xsl:text></xsl:element><xsl:element name="h2">Actors list</xsl:element></xsl:element><xsl:element name="body"><xsl:variable name="actorNames" select="/movies/movie/cast/actors/actor/name"/><xsl:apply-templates select="$actorNames[generate-id() = generate-id(key('kName', .)[1])]"><xsl:sort select="./name"/></xsl:apply-templates></xsl:element></xsl:element></xsl:template><xsl:template match="name"><xsl:element name="a"><xsl:attribute name="href">actor_details.php?movieID=<xsl:value-of select="../../../../@movieID"/>&amp;actorID=<xsl:value-of select="../@actorID"/></xsl:attribute><xsl:value-of select="." /></xsl:element><xsl:element name="br" /></xsl:template>