Problem running a basic test program about v7 HOT 2 OPEN

#include "v7.h"

static enum v7_err
    js_get_1024(struct v7 *v7, v7_val_t *res)
{
    *res = v7_mk_number(v7, 1024);
    return V7_OK;
}

int
    main(void)
{
    struct v7*
        v7 = v7_create();
    v7_set_method(v7, v7_get_global(v7), "get_1024", js_get_1024);
    v7_val_t
        result = V7_INTERNAL_ERROR;
    enum v7_err
        status = v7_exec(v7, "print('get_1024: ' + get_1024())", &result);
    if(status != V7_OK)
        fprintf(stderr, "error: %d\n", (int)status);
    else
        printf("result: %s\n", (enum v7_err)result == V7_OK ? "success" : "failure");
    v7_destroy(v7);
    return (int)status;
}