hi! i try to design a templete for my universty project. i wrote the follwing cod:

#ifndef _LinkedList_H_
#define _LinkedList_H_
#include "Link.h"
#include <ostream>
template <class L>//error one
class LinkedList
{
private:
 Link<L> *pm_head;
 Link<L> * pm_tail;
 int m_numOfElements;
 Link<L>* FindLink(L * dataToFind);
public:
 LinkedList();
 ~LinkedList();
 int GetNumOfElements(){return m_numOfElements;}
 bool Add( L * data);
 L *FindData(L * data);

template <class L> friend ostream & operator<<(ostream& os,const LinkedList<L> listToprint);//error two
   L* GetDataOnTop();
   bool RemoveFromHead();
   L* Remove(L * toRemove);

this templete uses the link class templete

#ifndef _Link_H_
#define _Link_H_
template <class T>//error 3
class Link
{
private:
 T* m_data;
 Link* m_next;
 Link* m_prev;
public:
 Link(T* data);
 ~Link(void);
 bool Link::operator ==(const Link& other)const;

 /*getters*/
 Link* GetNext()const {return m_next;}
 Link* GetPrev()const {return m_prev;}
 T* GetData()const {return m_data;}
 //setters
 void SetNext(Link* next) {m_next = next;}
 void SetPrev(Link* prev) {m_prev = prev;}
 void SetData(T* data) {m_data = data;}

};

error one: shadows template parm class L' error two:declaration ofclass L' error three: shadows template parm `class T'

i dont understand what is the problem. i can relly usr your help thank you :)