vs2015開啟之前的工程，新建QWidget類，出現cannot instantiate QtProjectEngine object報錯，無法找到路徑，之前解除安裝安裝過Qt外掛，可能是這個問題的原因。
解決方法是：
點選選單欄中 QT5–>Reinstall templates and register libraries即可。
cannot instantiate QtProjectEngine object
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