C++ Socket Programming - Socket won't bind. While working earlier - c++

Question

I have created a Socket class, everything was working perfect earlier. And just now every time I try to bind the socket server-side, it throws a bind error with message "Address already in use" while the port is free.
I am using macOS.
Should i use AF_INET or AF_UNIX?
This some of the code for the socket & bind.
// socket object class.
class Socket {
public:
int sock;
string address;
string port;
struct addrinfo address_info;
bool connected;
// initialize.
public:
Socket(string address__ = "", string port__ = "", bool initialize = false, int domain = -999, int type = -999, int protocol = -999) {
address = address__;
port = port__;
connected = false;
if (domain == -999) {
//domain = AF_INET;
domain = AF_UNIX;
//domain = 2;
} if (type == -999) {
type = SOCK_STREAM;
} if (protocol == -999) {
protocol = 0;
}
memset(&address_info, 0, sizeof address_info);
address_info.ai_family = domain;
address_info.ai_socktype = type;
address_info.ai_protocol = protocol;
if (initialize) {
print("Initialize socket...");
sock = socket(address_info.ai_family, address_info.ai_socktype, address_info.ai_protocol);
if (sock < 0) {
int e = errno;
string error = "BindError: Unable to initialize the socket.";
print(error);
throw BindError(error);
}
}
}
// bind server.
public:
int bind() {
int optVal = 1;
set_opt(SOL_SOCKET, SO_REUSEADDR, &optVal);
if (address_info.ai_family == AF_UNIX) {
//print("UNIX");
struct sockaddr_un addr;
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, address.c_str(), sizeof(addr.sun_path)-1);
int status = ::bind(sock, (struct sockaddr*)&addr, sizeof(addr));
if (status < 0) {
int e = errno;
string error = "BindError: Unable to bind with "+address+":"+port+" - "+strerror(e)+".";
print(error);
throw BindError(error);
}
return status;
}
//print("NON UNIX");
int status;
struct addrinfo *res;
address_info.ai_flags = AI_PASSIVE;
if ((status = getaddrinfo(address.c_str(), port.c_str(), &address_info, &res)) != 0) {
throw std::runtime_error("GetInfoError"); // gai_strerror(errno)
}
address_info.ai_addrlen = res->ai_addrlen;
address_info.ai_addr = res->ai_addr;
freeaddrinfo(res);
int max_attempts = 1;
for (int attempt = 0; attempt < max_attempts; ++ attempt) {
status = ::bind(sock, address_info.ai_addr, address_info.ai_addrlen);
if (status >= 0) {
break;
}
if (status < 0 && attempt >= max_attempts - 1) {
//cout << sock << " - " << address_info.ai_addr << " - " << address_info.ai_addrlen << " - " << "\n";
int e = errno;
string error = "BindError: Unable to bind with "+address+":"+port+" - "+strerror(e)+".";
print(error);
throw BindError(error);
}
}
return status;
}
};
Does anyone have an idea how to fix this?