Can't make NCReport work on Windows

[pucara_faa]

Hi everybody,
I'm having problems when trying to run an application with NCReports.
Here is the thing: I have installed Qt 4.5.2, with Qt Creator 1.2.1, and I had downloaded the NCReports from here http://www.nocisoft.com/?id=down&lang=en (NCReport_2.4.1_Win32_MinGW.exe). I installed it and everything was working perfect. I tried some examples, that showed how to make NCReports run from a Qt application, and they worked too.

But when I try to include it in my application, I get "application exited with code -1073741515".

This is my .pro file:

DEFINES += NCREPORT_IMPORT
LIBS += "C:\Archivos de programa\NCReport\2.4.1.mingw\lib\ncreport2.dll"
INCLUDEPATH += "C:\Archivos de programa\NCReport\2.4.1.mingw\include"
QT += xml sql
TEMPLATE = app
DEFINES += QT_NO_DEBUG_OUTPUT
 
CONFIG += warn_on \
          qt \
          thread \
          release
 
# Input
HEADERS += ......
SOURCES += ......
RESOURCES += resources.qrc

DEFINES += NCREPORT_IMPORT
LIBS += "C:\Archivos de programa\NCReport\2.4.1.mingw\lib\ncreport2.dll"
INCLUDEPATH += "C:\Archivos de programa\NCReport\2.4.1.mingw\include"
QT += xml sql
TEMPLATE = app
DEFINES += QT_NO_DEBUG_OUTPUT

CONFIG += warn_on \
          qt \
          thread \
          release

# Input
HEADERS += ......
SOURCES += ......
RESOURCES += resources.qrc

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And in the class that creates the report, I include these headers:

#include "ncreport.h"
#include "ncreportoutput.h"
#include "ncreportpreviewoutput.h"
#include "info.h"
#include "ncreportpreviewwindow.h"
#include "utils.h"

#include "ncreport.h"
#include "ncreportoutput.h"
#include "ncreportpreviewoutput.h"
#include "info.h"
#include "ncreportpreviewwindow.h"
#include "utils.h"

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Then, I compile and everything works great. After that, I add the line

NCReport *report = new NCReport;

NCReport *report = new NCReport;

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Then, I compile again and get "application exited with code -1073741515".
I don't know what I am missing, the example projects work, and I think that there are no difference between those projects and mine.
Please, If someone can help me, I'll be really thanked.
Best regards,
Facundo