Error Compile in VS2013 Compiler

[derit]

qtmaterialtabs.cpp B:\Dev\Qt\test\gui\qt-material-widgets-master\components\qtmaterialtabs.cpp(21) : error C3083: '{ctor}': the symbol to the left of a '::' must be a type B:\Dev\Qt\test\gui\qt-material-widgets-master\components\qtmaterialtabs.cpp(22) : error C2533: 'QtMaterialTabsPrivate::init' : constructors not allowed a return type qtmaterialautocomplete.cpp B:\Dev\Qt\test\gui\qt-material-widgets-master\components\qtmaterialautocomplete.cpp(159) : error C3083: '{ctor}': the symbol to the left of a '::' must be a type B:\Dev\Qt\test\gui\qt-material-widgets-master\components\qtmaterialautocomplete.cpp(160) : error C2533: 'QtMaterialAutoComplete::event' : constructors not allowed a return type B:\Dev\Qt\test\gui\qt-material-widgets-master\components\qtmaterialautocomplete.cpp(160) : error C2556: 'QtMaterialAutoComplete::QtMaterialAutoComplete(QEvent *)' : overloaded function differs only by return type from 'bool QtMaterialAutoComplete::event(QEvent *)' b:\dev\qt\test\gui\qt-material-widgets-master\components\qtmaterialautocomplete.h(25) : see declaration of 'QtMaterialAutoComplete::event' Generating Code...