Issue while installing hadoop-2.2.0 in linux 64 bit machine - hadoop

Question

Using this link ,tried installing Hadoop version - 2.2.0(single node cluster)in ubuntu 12.04(64 bit machine)
http://bigdatahandler.com/hadoop-hdfs/installing-single-node-hadoop-2-2-0-on-ubuntu/
while formatting the hdfs file system via namenode using the following command
hadoop namenode -format
when i'm doing that ,getting the following issue,
14/08/07 10:38:39 FATAL namenode.NameNode: Exception in namenode join
java.lang.RuntimeException: org.xml.sax.SAXParseException; systemId: file:/usr/local/hadoop/etc/hadoop/mapred-site.xml; lineNumber: 27; columnNumber: 1; Content is not allowed in trailing section.
What shall i need to do inorder to solve the following issue?
Mapred-site.xml:
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!--
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License. See accompanying LICENSE file.
-->
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>
</configuration>

Answer 1

14/08/07 10:38:39 FATAL namenode.NameNode: Exception in namenode join java.lang.RuntimeException: org.xml.sax.SAXParseException; systemId: file:/usr/local/hadoop/etc/hadoop/mapred-site.xml; lineNumber: 27; columnNumber: 1; Content is not allowed in trailing section
Probably some caracter in your XML that you forget to erase. Please post your full XML. Like #Abhishek said!