View Compilation Error

339107_0_2654.cpp: In function `int main()':
339107_0_2654.cpp:37: error: invalid initialization of non-const reference of type 'std::string&' from a temporary of type 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >'
339107_0_2654.cpp:7: error: in passing argument 1 of `int convert(std::string&, nummap&)'
339107_0_2654.cpp:37: error: invalid initialization of non-const reference of type 'std::string&' from a temporary of type 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >'
339107_0_2654.cpp:7: error: in passing argument 1 of `int convert(std::string&, nummap&)'