Need help with RSS feed

{preload_replace:master_channel_name="blog"}
{exp:rss:feed channel="{master_channel_name}"}
<?xml version="1.0" encoding="{encoding}"?>
<rss version="2.0"
    xmlns:dc="http://purl.org/dc/elements/1.1/"
    xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
    xmlns:admin="http://webns.net/mvcb/"
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:content="http://purl.org/rss/1.0/modules/content/">

<channel>
    
    <title><![CDATA[{channel_name}]]></title>
    <link>{channel_url}</link>
    <description>{channel_description}</description>
    <dc:language>{channel_language}</dc:language>
    <dc:creator>{email}</dc:creator>
    <dc:rights>Copyright {gmt_date format="%Y"}</dc:rights>
    <dc:date>{gmt_date format="%Y-%m-%dT%H:%i:%s%Q"}</dc:date>
    <aresource="http://expressionengine.com/">
    
{exp:channel:entries channel="{master_channel_name}" limit="10" dynamic_start="on" disable="member_data|pagination" dynamic="no"}
    <item>
      <title><![CDATA[{title}]]></title>
      <link>{channel_url}</link>
      <guid>{channel_url}#When:{gmt_entry_date format="%H:%i:%sZ"}</guid>
      <description><![CDATA[{summary}{body}]]></description>
      <dc:subject><![CDATA[{categories backspace="1"}{category_name}, {/categories}]]></dc:subject>
      <dc:date>{gmt_entry_date format="%Y-%m-%dT%H:%i:%s%Q"}</dc:date>
    </item>
{/exp:channel:entries}
    
    </channel>
</rss>
{/exp:rss:feed}