I am having this runtime error when trying to load a plugin with Qt's QPluginLoader.

I am on windows 7 N x64 and VS2010.

The error is:

The plugin '[absolute path to the .DLL file]/TestPlugin.dll' uses incompatible Qt library. (4.8.2) [debug]
Note that if I change build type to Release, the error shown is now

The plugin '[absolute path to the .DLL file]/TestPlugin.dll' uses incompatible Qt library. (4.8.2) [release]
This is the test code I am using:

This is the Interface (it's both in the main app project and in the plugin project)
Qt Code: 
  1. #ifndef NEWTESTPLUGIN_H
  2. #define NEWTESTPLUGIN_H
  3.  
  4. class INewInterface
  5. {
  6. public 
  7.     virtual ~INewInterface() {}
  8.     virtual void popUp() = 0;
  9. };
  10.  
  11. Q_DECLARE_INTERFACE( INewInterface , "NewInterface")
  12.  
  13. #endif //NEWTESTPLUGIN_H
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My test plugin.h:

Qt Code: 
  1. #ifndef NEWTESTPLUGIN_H
  2. #define NEWTESTPLUGIN_H
  3.  
  4. #include "INewInterface.h"
  5. #include "QtGui\\qwidget.h"
  6. #include "QtGui\\qlabel.h"
  7. #include "QtGui\\qboxlayout.h"
  8. class NewTestPlugin : public QWidget, public INewInterface
  9. {
  10.     Q_OBJECT
  11.     Q_INTERFACES(INewInterface)
  12.  
  13. public:
  14.     NewTestPlugin(QObject *parent = 0);
  15.     void popUp();
  16.     QVBoxLayout * m_layout;
  17.     QLabel * m_label;
  18.  
  19. private:
  20.     bool initialized;
  21. };
  22.  
  23. #endif // NEWTESTPLUGIN_H
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and .cpp
Qt Code: 
  1. #include "customwidget.h"
  2.  
  3. #include <QtCore/QtPlugin>
  4. #include "newtestplugin.h"
  5.  
  6. NewTestPlugin::NewTestPlugin(QObject *parent)
  7. {
  8.     m_label = new QLabel("ESTO ES UN PLUGIN!");
  9.     m_layout = new QVBoxLayout();
  10.     m_layout->addWidget(m_label);
  11.     setLayout(m_layout);
  12. }
  13.  
  14. void NewTestPlugin::popUp()
  15. {
  16.     this->show();
  17. }
  18.  
  19. Q_EXPORT_PLUGIN2(NewTestPlugin, NewTestPlugin)
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This is how I try to load it:

Qt Code: 
  1. if(token==QXmlStreamReader::StartElement)
  2.         {
  3.             if(m_xmlRStream->name()=="Game")
  4.             {
  5.                 QString textFromElement = m_xmlRStream->readElementText();
  6.                 QPushButton * button = new QPushButton(textFromElement, this);
  7.                 button->setMinimumSize(150, 150);
  8.                 m_mainLayout->addWidget(button);
  9.  
  10.                 //create a pluginLoader
  11.                 QPluginLoader loader("C:/Users/TestDllProject/Win32/Debug/TestPlugin.dll");
  12.                 QObject * plugin = loader.instance();
  13.                 if(plugin)
  14.                 {
  15.                     INewInterface* asd = qobject_cast<INewInterface*>(plugin);
  16.                     asd->popUp();
  17.                 }
  18.                 else
  19.                 {
  20.                     QMessageBox * pluginErrorMessageBox = new QMessageBox(this);
  21.                     pluginErrorMessageBox->information(this,"Error loading DLL","Requested DLL wasn't properly loaded.\n \n" + loader.errorString(), pluginErrorMessageBox->Ok);
  22.                     QPluginLoader loader("C:/Users/TestDllProject/Win32/Debug/NewTestPlugin.dll");
  23.                     QObject * plugin = loader.instance();
  24.                     if(plugin)
  25.                     {
  26.                         INewInterface* asd = qobject_cast<INewInterface*>(plugin);
  27.                         asd->popUp();
  28.                     }
  29.                     else
  30.                     {
  31.                         pluginErrorMessageBox = new QMessageBox(this);
  32.                         pluginErrorMessageBox->information(this,"Error loading DLL","Requested DLL wasn't properly loaded.\n \n" + loader.errorString(), pluginErrorMessageBox->Ok);
  33.                         exit(1);
  34.                     }
  35.                }
  36.             }
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I honestly dont know what I am doing wrong, and all google found out had mostly nothing to do with what I am doing.

I am using 4.8.2, for both the DLL and the .Exe (Also, they are both in the same solution).

Any help on the issue would be greately appreciated.

As always, if I am not providing appropiate info, please let me know what you need.

Thank you.