LNK2019 (Unresolved external symbol) When Compiling with MSVC2013 - c++

Question

Im working on a project using Qt/C++ originally compiled with MinGW64 (gcc 4.8). I decided to "port" it to MSVC2013, since I need to use some Windows API functions that doesn't work well in MinGW, but right now I'm stuck at this error:
mainwindow.obj:-1: error: LNK2019: unresolved external symbol "public: void __cdecl IMLoginView::clearFieldPass(void)" (?clearFieldPass#IMLoginView##QEAAXXZ) referenced in function "public: void __cdecl MainWindow::showConnectionErrorDialog(void)" (?showConnectionErrorDialog#MainWindow##QEAAXXZ)
imingestinglist.obj:-1: error: LNK2019: unresolved external symbol "public: static class QString __cdecl IMStorageSystem::getLogDir(void)" (?getLogDir#IMStorageSystem##SA?AVQString##XZ) referenced in function "private: class QList<int> __cdecl IMIngestingList::loadList(void)" (?loadList#IMIngestingList##AEAA?AV?$QList#H##XZ)
moc_imloginview.obj:-1: error: LNK2019: unresolved external symbol "public: void __cdecl IMLoginView::login(void)" (?login#IMLoginView##QEAAXXZ) referenced in function "private: static void __cdecl IMLoginView::qt_static_metacall(class QObject *,enum QMetaObject::Call,int,void * *)" (?qt_static_metacall#IMLoginView##CAXPEAVQObject##W4Call#QMetaObject##HPEAPEAX#Z)
moc_imloginview.obj:-1: error: LNK2019: unresolved external symbol "public: void __cdecl IMLoginView::handleError(enum ALFRED_ACCESS_ERROR)" (?handleError#IMLoginView##QEAAXW4ALFRED_ACCESS_ERROR###Z) referenced in function "private: static void __cdecl IMLoginView::qt_static_metacall(class QObject *,enum QMetaObject::Call,int,void * *)" (?qt_static_metacall#IMLoginView##CAXPEAVQObject##W4Call#QMetaObject##HPEAPEAX#Z)
moc_imloginview.obj:-1: error: LNK2019: unresolved external symbol "public: void __cdecl IMLoginView::userDisconnected(void)" (?userDisconnected#IMLoginView##QEAAXXZ) referenced in function "private: static void __cdecl IMLoginView::qt_static_metacall(class QObject *,enum QMetaObject::Call,int,void * *)"
The problem is: These methods aren't part of some external library, but part of the project itself. And I already triple checked that they are implemented. They aren't part of any template class either, but normal classes, and the log says the cpp files are being compiled. The same project links just fine with MinGW64.
I'm currently using Qt Creator 3.3.2 and QT 5.3.2.
What can be happening?
EDIT:
I Can't show much code, since its a closed-source project, but I can at least show the header and implementation layout of the methods:
imloginview.h:
class IMLoginView : public QWidget
{
Q_OBJECT
public:
explicit IMLoginView(QWidget *parent = 0);
void clearFieldPass();
~IMLoginView();
private:
//Lots of attributes
void configureComponents();
void keyPressEvent(QKeyEvent *event);
signals:
public slots:
void login();
void handleError(ALFRED_ACCESS_ERROR error);
void userDisconnected();
}
imloginview.cpp:
IMLoginView::IMLoginView(QWidget *parent) : //lots of initializations here
{
//Implementation
}
IMLoginView::~IMLoginView()
{
}
void IMLoginView::clearFieldPass()
{
//implementation
}
void IMLoginView::configureComponents()
{
//Implementation
}
void IMLoginView::keyPressEvent(QKeyEvent *event)
{
//implementation
}
void IMLoginView::login()
{
//implementation
}
void IMLoginView::handleError(ALFRED_ACCESS_ERROR error)
{
//implementation
}
void IMLoginView::userDisconnected()
{
//implementation
}
I'm sorry I really can't provide the actual method code, but its closed-source. =/