Compilation errors C2589, C2062, C2059, C2988, C2143

My program had been compiling with no problems, but now I started to get several errors when I try to compile. I'm using Windows 10, Qt 5.15, Qt Creator 8.0.1, MSVC 2019 Here's the list of errors (in Portuguese, sorry): All the errors make reference to t

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Compile error in hidden module: clsAbout

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Retrieving the COM class factory for component failed due to the

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Критическая ошибка Error during initialization

حل مشكلة Error #1009 Cannot access a property or method of a null

error C2589: “(”: “::”右边的非法标记error C2059: 语法错误