Rapidxml parse gives an error!

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XML

Eclipse

C++11

I'm trying to read an XML file using c++ in eclipse. I am using 'rapidXML' library to achieve this. But once I try to run the program, it terminates saying,

terminate called after throwing an instance of 'rapidxml::parse_error'<br />
  what():  expected ' or "

The code:

xml_document<> doc;
xml_node<> * rootNode;

//read the xml file into vector
ifstream xmlFile("Exchange.xml");
xmlFile.unsetf(ios::skipws);
vector<char> buffer ((istreambuf_iterator<char>(xmlFile)), istreambuf_iterator<char>());
buffer.push_back('\0');

//Parse the buffer
doc.parse<0>(&buffer[0]);

//getting the root node
rootNode = doc.first_node("Exchange");

//Iterating through the file
xml_node<> * sourceId;

for(sourceId = rootNode->first_node("sourceId"); sourceId; sourceId = sourceId->next_sibling()){
    cout << sourceId->value() << " : " << sourceId->first_attribute("interval")->value() << endl;
}

The XML file:

<pre><?xml version="1.0" encoding="UTF-8"?>
<Exchange>
	<sourceId interval = 03>ADSM<sourceId/>
	<sourceId interval = 06>ASE<sourceId/>
	<sourceId interval = 09>BSE<sourceId/>
	<sourceId interval = 12>CSAE<sourceId/>
	<sourceId interval = 15>CSE<sourceId/>
	<sourceId interval = 18>TDWL<sourceId/>
</Exchange>

NOTE: The above code is in a single method which calls in the main method. I just want to print the attribute value and the child value of the nodes. How can I solve this? Thank you!

What I have tried:

I tried using file<> method in rapidxml_util

//read the xml file into vector
file<> xmlFile("Exchange.xml");


//Parse the buffer

doc.parse<0>(xmlFile.data());