C++ Process terminated with status 3 confusion

I am very new to programming, but have been following c++ tutorials and amassing a number of PDFs for the last week or so to help me out. I couldn't find anything in them or online that answered my question clearly enough. Please forgive me for my newbie-ness.

Pertinent code:

Logfile.hpp

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
// HEADER :: CLASS INTERFACE FILE

// ==============================
// Include Guard
#ifndef __LOGFILE_INCLUDED__ // If Actor.hpp hasn't been included yet
#define __LOGFILE_INCLUDED__ // Define this for the compiler so it knows it has now been included

// ==============================
// Forward declared dependencies

// ==============================
// Included dependencies
#include <iostream>
#include <fstream>

// ==============================
// Actual class
class Logfile { // Logfile
public:
    // Globally accessible variables
    bool LACT; // Is log file active?
    std::ofstream LOG; // Actual log file
    std::string entry; // Data to be entered in log file

    // ==============================
    // Core methods
    Logfile(); // Constructor
    ~Logfile(); // Destructor

    // Additional methods
    bool isActive(); // Is log file active?
    void logEntry(std::string entry); // Make an entry in the log if 'LACT' is set to true
    void toggleLog(); // Toggle log file open or closed
};

extern Logfile *log; // This variable is declared in main

#endif // __LOGFILE_INCLUDED__

Logfile.cpp

// ==============================
// Included dependencies
#include "Logfile.hpp"

// ==============================
// Core methods
Logfile::Logfile() { // Constructor
    LACT = true; // Toggle logfile to active
    LOG.open ("LOG.txt"); // Open 'log.txt' and prepare it to receive 'LOG' entries
    LOG << "LOG FILE CLASS CONSTRUCTED\n";
    LOG << "LOG FILE OPENED\n";
}

Logfile::~Logfile() { // Deconstructor
    LOG << "LOG FILE CLOSED\n";
    LOG << "LOG FILE CLASS DECONSTRUCTED";
    LOG.close(); // Close log file
}

// Additional methods
bool Logfile::isActive() { // Is log file active?
    if ( LACT ) return true;
    else return false;
}

void Logfile::logEntry(std::string entry) { // Make an entry in the log if 'LACT' is set to true
    if ( LACT ) LOG << entry << std::endl;
}

void Logfile::toggleLog() { // Toggle log file open or closed
    if ( LACT ) { // Log file is active
        LOG << "LOG FILE CLOSED\n";
        LOG.close(); // Close log file
    } else { // Log file is inactive
        LOG.open ("LOG.txt"); // Open 'log.txt' and prepare it to receive 'LOG' entries
        LOG << "LOG FILE OPENED\n";
    }
}

Engine.hpp

// ==============================
// Forward declared dependencies
class Logfile;

class Engine { // Core system, main loop
public :
    // Globally accessible variables 
    Logfile *log; // Declare 'log' as an empty pointer (*)

Engine.cpp

// ==============================
// Included dependencies
#include "Logfile.hpp"

// ==============================
// Core methods
Engine::Engine() { // Constructor method
    // Initialization
    log = new Logfile(); // Declare 'log' as pointer to access log file
    TCODConsole::initRoot(80,50,"Testbed",false); // Create 'root' console (not fullscreen)
    if ( log->isActive() ) log->logEntry("(TCODConsole) Root console initialized"); // WORKS

Map.hpp

// ==============================
// Forward declared dependencies
class Logfile;

extern Logfile *log; // Pointer exists in Engine.hpp

Map.cpp

// ==============================
// Included dependencies
#include "Logfile.hpp"

if ( log->isActive() ) log->logEntry("(TCODConsole) Root console initialized"); TERMINATION STATUS 3
if ( tiles[(x-1)+y*width].tType =="floor" ) tally++; // Left tile status, add 1 to tally if floor  :  TERMINATION STATUS 3
if ( tiles[(x-1)+(y-1)*width].canWalk ) tally++; // Left-top tile status, add 1 to tally if floor  :  WORKS

If I understand correctly, a termination status 3 indicates that I am referencing a variable incorrectly in regards to whether it's a pointer or not...? I initially ran into the problem when I wanted to access the tType string from an individual tile in the 2Darray in Map.cpp (though I can access the boolean variable canWalk just fine...), and couldn't figure out what was wrong, so I decided to learn to implement an external log to find the problem...but I guess I found my way back to the same issue while doing that...

Any help is greatly appreciated, as is criticism, I have a lot to learn.

My initial purpose for asking this question was (now I realize) to get a globally declared object accessible from any *.cpp file in a multi-file program. I just found this answer: http://www.cplusplus.com/forum/beginner/3848/, in case this might be helpful to anyone else with a similar problem.

In your Logfile.hpp you're missing #include <string>: one of your LogFile classes variables are declared std::string so you need to include that.

In your Engine.cpp you forget to include your Engine.hpp where your LogFile *log; variable is declared. this results in an error in your Engine.cpp file where you try assigning a new LogFile object to it.

So add #include <string> to the top of your Logfile.hpp and add #include "Engine.hpp" to the top of your Engine.cpp