TreeMap using Binary Search Tree

JAVA:

I want to create a TreeMap using a Binary Search Tree using Entry, however my class BST:

public class BST<V> implements Iterable<V>{}

doesn't like if in my TreeMap class:

public class TreeMap<K, V> implements Map<K, V> {

I decide to implement a new instance of that class of the type Entry as follows:

private BST<Entry<K,V>> theMap;

I know it works for ArrayLists, so it must be something with my BST class, but for the love of me I can't figure out what it is.