Compiler error in template

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C++

I have a header file and a cpp file.

//////Node.h
	namespace Collections
	{
		/* Node */
		template<typename T>
		class Node
		{
		public:
			T element;
			Node *next;
			
			Node();
			Node(T element);
		};
	} // end namespace Collections

///// Node.cpp
#include "LinkedList.h"

	namespace Collections
	{
		template<typename T>
		Node<t>::Node()
		{
			next = NULL;
		}

		template<typename T>
		Node<t>::Node(T element)
		{
			this->element = element;
			next = NULL;
		}
	} // end namespace Collections


// app.cpp
// omit some "include"......
#include "collections/linkedlist.h"

using namespace std;
using namespace Collections;

int main()
{
	Node<string> *head;
	
	head = new Node<string>();
	head->element = "Nicky";
	head->next = NULL;
	tail = head;
	
	do
	{
		cout << tail->element << endl;
	}
	while(tail = tail->next);

	return 0;
}
</t></t>

then I CANNOT compile the project because of the error:
error LNK2019: cannot solve the external symbol ""public: __thiscall Collections::Node<class>,class std::allocator<char> > >::Node<class>,class std::allocator<char> > >(void)" (??0?$Node@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Collections@@QAE@XZ)"

Can anyone help me? It makes me confusing a lot..

And I CAN compile if I copy the code from CPP file to header file....