cannot find a script or extension object associated with namespace in xslt

I have generated XSLT using altova mapforce and in altova the xslt and output xml is getting generated without any issues.

when i copied the same xslt in visual studio 2013 and trying to run but ended up with below error Cannot find a script or an extension object associated with namespace 'http://ift.tt/tphNwY'.

<xsl:stylesheet version="2.0" xmlns:xsl="http://ift.tt/tCZ8VR"
     xmlns:xs="http://ift.tt/tphNwY"
  xmlns:core="http://ift.tt/1AivvcP" 
  xmlns:vmf="http://ift.tt/165VpTT" 
  xmlns:ns0="http://ift.tt/1vbo6aU"   
  xmlns:fn="http://ift.tt/pEXiIz" exclude-result-prefixes="core vmf ns0 xs fn">
    <xsl:template name="core:firstCharacter">
        <xsl:param name="value" select="()"/>
        <xsl:param name="default" select="()"/>
        <xsl:choose>
            <xsl:when test="(fn:string-length($value) = xs:integer('0'))">
                <xsl:sequence select="$default"/>
            </xsl:when>
            <xsl:otherwise>
                <xsl:variable name="var1_resultof_cast" as="xs:double" select="xs:double(xs:integer('1'))"/>
                <xsl:sequence select="fn:substring($value, $var1_resultof_cast, $var1_resultof_cast)"/>
            </xsl:otherwise>
        </xsl:choose>
    </xsl:template>

<xsl:template match="/">
        <xsl:variable name="var1_resultof_cast" as="xs:string" select="xs:string(xs:decimal('0'))"/>
        <xsl:variable name="var2_entry" as="node()?" select="entry"/>
        <xsl:variable name="var3_resultof_map" as="xs:string*">

Error at below line:

<xsl:variable name="var1_resultof_cast" as="xs:string" select="xs:string(xs:decimal('0'))"/>