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Can not add library

  • Hi all

    I am trying to make a desktop GUI app on Windows 10 using Python 3.8+Visual Studio 2019.
    I have installed PySide2 on Python3.
    I launched QtCreator 4.13, placed the labels and buttons in design mode and saved the form.
    But when I open the project again I get the following error

    It looks like Qt Creator closed because of a problem with the "QmlDesigner" plugin.
    Temporarily disable the plugin.

    Qt Version is Qt 5.12
    Kit is Desktop Qt 5.15.0 MSVC2019 64bit
    Imported library is QtQuickCpntrols 2.15

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