Missing library while creating document element??

[magicstar]

Hi all

I have created my class and in the constructor, i need to create a new node.This is the code within the constructor:
{
Document* m_globalNode;
m_globalNode = new Document();
Element * tmp;
tmp =m_globalNode->createElement((DOMString) "ROOT");
}

However, when i compile i get the following error:

Unsatisfied symbol "Document::Document()"

I think there is a problem of missing library.Can someone please help??

Thks

magicstar