View Compilation Error

GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_function.h: In function `int main()':
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_function.h:134: error: `template<class _Tp> struct std::plus' is not a function,
0_0_8272129_19294.cpp:29: error:   conflict with `void plus(std::string, std::string)'
0_0_8272129_19294.cpp:38: error:   in call to `plus'