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Can't figure out a vector<struct> error

Shalmander (4)
I'm learning genetic algorithms and have started writing a program to test some stuff out. Right now all the program does is seed a struct and push it into a vector. Any clue as to what is causing this linking error. I'm usually visual express 2008.

error LNK2019: unresolved external symbol impCrtDbgReportW referenced in function "public: struct gastruct & thiscall std::vector<struct gastruct,class std::allocator<struct gastruct> >::operator[](unsigned int)" (??A?$vector@Ugastruct@@V?$allocator@Ugastruct@@@std@@@std@@QAEAAUga_struct@@I@Z)

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#include "SDL.h"
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <time.h>
#include <math.h>

define GA_POPSIZE 2048 // ga population size
define GA_MAXITER 16384 // maximum iterations
define GA_MUTATIONRATE .05f // mutation percentage rate
define GA_TARGET 60 // top fitness
define GA_MOVES 80 // movement points

using namespace std;

struct ga_struct {

     string str;
     unsigned int fitness;
     float matingPossiblity;

};

typedef vector<ga_struct> ga_vector;

void init_population(ga_vector &population) {

    int tsize = GA_MOVES * 3;
    int psize = GA_POPSIZE;

    for(int i = 0; i < psize; i++) 
    {
        ga_struct citizen;

        citizen.fitness = 0;
        citizen.matingPossiblity = 0.0f;
        citizen.str.erase();

        for(int j = 0; j < tsize; j++)
            citizen.str.at(j) = (rand() % 2) + 48;

        population.push_back(citizen);
    }

}

void calc_fitness(ga_vector &population) {

    // do nothing

}

void sort_fitness(ga_vector &population) {

    // do nothing

}

void mutate(ga_vector &member) {

    int tsize = GA_MOVES * 3;
    int psize = GA_POPSIZE;
    double mutation = GA_MUTATIONRATE * 100.0;
    int random = 0;

    for(int j = 0; j < psize; j++)
    {
        for(int i = 0;i < tsize; i++)
        {
            random = (rand() % 100) + 1;

            if(random < mutation)
            {
                if(member[j].str.at(i) == '0')
                    member[j].str.at(i) = '1';
                else
                    member[j].str.at(i) = '0';
            }
        }
    }

}

void mate(ga_vector &population) {

    // do nothing at this time

}

void draw_best(ga_vector &population) {

    // do nothing at this time

}

int main( int argc, char* args[] ) {

    //Start SDL
    SDL_Init(SDL_INIT_VIDEO);

    srand(unsigned(time(NULL)));

    ga_vector pop_alpha;
    ga_vector *population;

    init_population(pop_alpha);
    population = &pop_alpha;

    // game loop
    for( int i = 0; i < GA_MAXITER; i++) 
    {
        calc_fitness(*population);
        sort_fitness(*population);
        draw_best(*population);

        // if((*population)[0].fitness == 100)
            // break;

        mate(*population);
        mutate(*population);
    }

    // move between best fitness screen

    //Quit SDL
    SDL_Quit();

    return 0;    

}


Thank you for any help and thank you for at least reading over it.
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