C/C++ :: Getting Errors On String And Enum Variable Declarations?

I need to do this simple Battleship game project for my C++ class. Here is my current code so far:

#include <iostream>
#include <array>
#include <string>
using namespace std;
enum BShip{ EMPTY, BTLSHIP, HIT, MISS };
const int BSIZE = 6;
const int BTLSHIP_SIZE = 4;
class Battleship {
private:
array<array<Bship, BSIZE>, BSIZE> sea, hits;

[code]....

For some reason, I'm getting errors on the string and enum declarations.