如上图，windows下重新编译程序之后出现这个错误，*上有相关的解决方法，但是我照做之后还是报这个错。
然后我灵机一动，去看了下环境变量，发现环境变量里既有5.12版本又有5.9版本(我当前使用的)，估计是冲突了，把5.12的环境变量删除上述问题得到解决。
【Qt】This application failed to start because no Qt platform plugin could be initialized
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