To perform find/count operation on map c++

I have map data structure map<string, vector< pair<string, string> >, where map key is of string data type and value is vector<pair<string, string> > data type.

if i try to perform find or count operation using key value which is of string data type. I do get compilation issue.

why is it behaving so? i should have able to perform either find/count operation on map!

basically i have typedef the map data structure as below:-

typedef pair<string,string> attribute_pair;
typedef vector<attribute_pair> attribute_vector;
typedef map<string,attribute_vector> testAttribute_map;

part of the code snippet where trying to perform find operation

 testAttribute_map attributes;
 string fileName = "Hello.cpp";
 if(testAttribute_map iter = attributes.find(fileName))
   {
       cout<<"success"<<endl;
   }

compilation error:

 error: conversion from ‘std::map<std::__cxx11::basic_string<char>, std::vector<std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> > > >::iterator {aka std::_Rb_tree_iterator<std::pair<const std::__cxx11::basic_string<char>, std::vector<std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> > > > >}’ to non-scalar type ‘testAttribute_map {aka std::map<std::__cxx11::basic_string<char>, std::vector<std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> > > >}’ requested