c++ error C2664 cannot convert argument 1

Question

I'm creating a binary tree and I'm trying to implement a function for creating that tree. So that is the code for every member of the tree

template <typename T>
struct Node
{
    T data;
    Node* left;
    Node* right;
    Node()
    {
        data = NULL;
        left = NULL;
        right = NULL;
    }
};

The "BinaryTree" class have only one member called "root" whose type is Node and my function for creating the tree is:

void CreateTree(istream &in)
{
    char help;
    int data;
    in >> help;
    while (help == 'y')
    {
        in >> data;
        addLeaf(root, data);
        in >> help;
    }
}

and the addLeaf function is:

void addLeaf(Node<T>* &nod, int data)
{
    if (nod == NULL)
    {
        nod = new Node<T>();
        nod->data = data;
    }
    else if (data < nod.data) addLeaf(nod->left, data);
    else addLeaf(nod->right, data);
}

The result is:

error C2664: 'void BinaryTree::addLeaf(Node *&,int)' : cannot convert argument 1 from 'Node' to 'Node *&'

What should I do?