Can't add a qt class to my project

  • Hi ,
    I am trying to add a qtClass using class wizard , I had chosen Qt4GuiClass then press next , then a message display to me says "it is impossible to add a qtgui class to the current project, as it was not created using Qt4VSAddin"

    so why this message displayed to me and how I can add a qt class to my project??

    note: I use VS2010

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