‘internalPath’ (type ‘std::string {aka std::basic_string

I am running below line of code from a function

string internalPath(os.str());
   m_tags.insert(make_pair<string, TagConfig >(internalPath, tagConfig ));

error: no matching function for call to ‘make_pair(std::string&, const wicom::TagConfig&)’
m_tags.insert(make_pair<string, TagConfig >(internalPath, tagConfig ));
                                                                    ^

Compiler g++=C++14