a very strange c++ problem, ask for help!! thanks!!

["feng jiao" <jiaofeng1977@xxxxxxxxxxx>]

using namespace std;//add by fengjiao
template<typename elemType>
class permutation
{


       public:
       vector< vector<elemType> > getpermutation(vector< vector<elemType> 
>& src_collection);
       private:
       vector< vector<elemType> > permutationaux(vector<elemType>& vec, 
vector< vector<elemType> >& tmp_collection);
};



template<typename elemType>
vector< vector<elemType> > permutation<elemType>::getpermutation(vector< 
vector<elemType> >& src_collection)
{
       vector< vector<elemType> > results_collection;
       vector< vector<elemType> >::iterator collection_itor = 
src_collection.begin();

when compile it
Permutation.h:22: error: expected `;' before "collection_itor"

Seems the compiler don't know vector< vector<elemType> >::iterator

if change to vector< vector<int> >::iterator, it also fine,
or don't use iterator, also no problem,

What is the problem? maybe the setting or other reason??

THanks