报错18:28:21: Debugging starts QLayout: Attempting to add QLayout ““ to MainWindow “MainWindow“, which

18:28:21: Debugging starts
QLayout: Attempting to add QLayout “” to MainWindow “MainWindow”, which already has a layout

问题原因：
If MainWindow is a QMainWindow and you build centralWidget in MainWindow just call setCentralWidget(centralWidget);

You can’t set a layout on a QMainWindow because it already has one that makes all the work for dock widgets etc.

QMainWindow 本身已经有一个layout了，不能再设置layout了。
之所以报错，是因为在QMainWindow中某个成员函数中，使用了：

QGridLayout *t_gridLayout_map = new QGridLayout(this);
改进措施：
QGridLayout *t_gridLayout_map = new QGridLayout();
去掉this之后，OK！！！
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原文链接：https://blog.csdn.net/weixin_43577616/article/details/115769477