Hi evivary,
I just start with Qt and i´m having this errors: 
QString
#include <QtGui>
#include <QtCore>
. . .
. . .
. . .
void EditWindow
::setFilename(const QString &filename
) {
myFilename = Utils::normalizeFilename(filename);
if (myFilename.isEmpty())
myName = tr("Untitled");
else
myName = fi.fileName();
}
#include <QtGui>
#include <QtCore>
. . .
. . .
. . .
void EditWindow::setFilename(const QString &filename)
{
myFilename = Utils::normalizeFilename(filename);
QFileInfo fi(myFilename);
if (myFilename.isEmpty())
myName = tr("Untitled");
else
myName = fi.fileName();
}
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and here is the error
Error 3 error LNK2019: sÃ*mbolo externo "__declspec(dllimport) protected: static void __cdecl QString::free(struct QString:: Data *)" (__imp_?free@QString@@KAXPAUData@1@@Z) sin resolver al que se hace referencia en la función "public: void __thiscall EditWindow:: setFilename(class QString const &)" (?setFilename@EditWindow@@QAEXABVQString@@@Z) C:\...\editwindow.obj SEditorV0
this happens when i want to generate a release solution
i'll been looking at the forum but i can't find some post who give me some help ... if somebody have an idea i really appreciate ... 
Qt 4.8
VS2010
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