stl 编译异常有关问题,

stl 编译错误问题,急急急!!!
程序中有段代码如下:
CHLAObject*   CRecorder::getObjInstance(RTI::ObjectClassHandle   handle)
{
map <RTI::InteractionClassHandle,   CHLAInteraction*> ::iterator   res   =   this-> objectClassHandleMap.find(handle);
.....
};

其中:CHLAObject是一个类,RTI::ObjectClassHandle是一个整形数,为啥编译的时候这段报错如下:
d:\vc   projects\Recorder\Recorder\Recorder.cpp(15)   :   error   C2440:   'initializing '   :   cannot   convert   from   'std::_Tree <_Traits> ::iterator '   to   'std::_Tree <_Traits> ::iterator '
                with
                [
                        _Traits=std::_Tmap_traits <RTI::ObjectClassHandle,CHLAObject   *,std::less <RTI::ObjectHandle> ,std::allocator <std::pair <const   RTI::ObjectClassHandle,CHLAObject   *> > ,false>
                ]
                and
                [
                        _Traits=std::_Tmap_traits <RTI::InteractionClassHandle,CHLAInteraction   *,std::less <RTI::ObjectHandle> ,std::allocator <std::pair <const   RTI::InteractionClassHandle,CHLAInteraction   *> > ,false>
                ]
                No   constructor   could   take   the   source   type,   or   constructor   overload   resolution   was   ambiguous

百度了些帖子,   试了些方法都不好使..求助!!!!
谢谢!!

[解决办法]
map <RTI::InteractionClassHandle, CHLAInteraction*> ::iterator
和this中的类型一样么
[解决办法]
cannot convert from 'std::_Tree <_Traits> ::iterator ' to 'std::_Tree <_Traits> ::iterator '

这两者类型是一样的啊