C++ synthesized method first required here

stringstream Team::parse_ws(string str){
stringstream stream(str);
return stream;
}

stringstream stream(parse_ws(buff));

include/team.cpp: In member function ‘std::stringstream Team::parse_ws(std::string)’:
include/team.cpp:8: note: synthesized method &#8216;std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >::basic_stringstream(const std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >&)&#8217; first required here


Что компилятор от меня хочет?