cannot convert parameter 1 from 'class List<int>::iterator' to 'class List<i

# include <iostream>
using namespace std;

template <typename T>
class List
{
private:
class Node;
int size;
Node* head;
Node* tail;
public:
class iterator;
List();
List(const List&);
~List();
const List& operator =(const List&);
iterator begin() {return iterator(head->next);}
iterator end() {return iterator(tail);}
int getsize() const {return size;}
bool empty() const {return getsize()==0;}
void clear() {while (!empty()) pop_front();}
T& front() {return *begin();}
T& back() {return *--end();}
void push_front(const T&x) {insert(begin(),x);}
void push_back(const T&x) {insert(end(),x);}
void pop_front() {erase(begin());}
void pop_back() {erase(--end());}
typename iterator insert(iterator iter,T x); //return the iterator referring to the element that was added
typename iterator erase(iterator);//return the iterator referring to the element after the one deleted
typename iterator erase(iterator,iterator);//to remove the range of elements denoted by the two iterators
};

main()
{
List<int> l1;
// List<int>::iterator it1;//=l1.begin();
for(int i=0;i<=10;i++)
l1.insert(l1.end(),i);
return 0;
}

出现如下错误,大家帮帮忙啊!!
C:\Documents and Settings\eastwinter\桌面\新建文件夹\list1.cpp(170) : error C2664: 'insert' : cannot convert parameter 1 from 'class List<int>::iterator' to 'class List<int>::iterator'
Source or target has incomplete type
我头疼啊,为什么一样还说不一样啊??????/?:(
问题已经解决,但是不想把分数浪费,呵呵,谁想要分的赶快来说声啊,抓紧时间拉.

我遇到了这样的问题error: cannot convert ‘std::vector<MyRect>::const_iterator’ to ‘const MyRect*’ for argument ‘1’ to ‘int is_equal(const MyRect*, const MyRect*)’，求帮助

期待看到有用的回答！

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