I have created the xslt as follows... for one slider..... which is as follows

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xsl:stylesheet [ <!ENTITY nbsp "&#x00A0;"> ]>
<xsl:stylesheet 
  version="1.0" 
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
  xmlns:msxml="urn:schemas-microsoft-com:xslt"
  xmlns:umbraco.library="urn:umbraco.library" xmlns:Exslt.ExsltCommon="urn:Exslt.ExsltCommon" xmlns:Exslt.ExsltDatesAndTimes="urn:Exslt.ExsltDatesAndTimes" xmlns:Exslt.ExsltMath="urn:Exslt.ExsltMath" xmlns:Exslt.ExsltRegularExpressions="urn:Exslt.ExsltRegularExpressions" xmlns:Exslt.ExsltStrings="urn:Exslt.ExsltStrings" xmlns:Exslt.ExsltSets="urn:Exslt.ExsltSets" xmlns:tagsLib="urn:tagsLib" xmlns:BlogLibrary="urn:BlogLibrary" 
  exclude-result-prefixes="msxml  umbraco.library  Exslt.ExsltCommon
 
Exslt.ExsltDatesAndTimes  Exslt.ExsltMath  Exslt.ExsltRegularExpressions
 Exslt.ExsltStrings  Exslt.ExsltSets  tagsLib BlogLibrary ">

<xsl:output method="xml" omit-xml-declaration="yes"/>

<xsl:param name="currentPage"/>

<xsl:template match="/">
 
 <!-- start writing XSLT 
   <xsl:variable name="sliderNode" select="$currentPage/parent::*/child::*[@level=1]"/>-->
   
 <xsl:variable name="sliderNode" select="$currentPage/ancestor-or-self::root/*[@nodeName='estrosliderforhome']"/>
   
  <div class="peKenBurns" data-logo="disabled" >
     
       <xsl:for-each select="$sliderNode/child::estro">
        
        <div data-delay="5" data-thumb="{thumb}">
                  <img src="images/blank.png" data-src="{umbracoFile}" alt="Banner Image 1" />
                  <h1><xsl:value-of select="teaserText" disable-output-escaping="yes"/></h1>
          </div>
        
          
        
       </xsl:for-each>
   
 </div>

</xsl:template>

</xsl:stylesheet>

But while saving it is showing "Xslt file could not be saved" error. so whats the problem?