Try installing the qt installation in the creator’s settings. These are tools -> options -> Build and Run -> Qt and add one if there is no binding. I'm not sure if this helps, but worth a try.
You can also create a project manually and import it into the creator.
Create a main.cpp file with content like
#include <QApplication>
And create a .pro file with the contents:
QT += core gui TARGET = Test SOURCES += main.cpp
After that, try importing the .pro file into the creator.
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