Failed to generate stub file for my package

The pybind11 code to generate module is:

class A
{
public:
	A()
	{

	}

	/**
	* @brief explanation from c++
	*/
	int Add(int a, int b)
	{
		return a+b; 
	}

};

PYBIND11_MODULE(module, m) {


    m.doc() = "My Library Python Bindings";

	py::class_<A>(m, "A")
		.def(py::init<>())
		.def("Add", &A::Add, "explanation from pybind");

}

And it successfully generated a python module, and I can import it:

Then, I want to generate the stub file for this module. I have tested the pybind11-stubgen, and it works:

However, it failed when generate stub file for my-self package:

How should I use the pybind11-stubgen?

Start by reproducing the pybind11-stubgen command against the package described in the issue and inspect the failure shown in the attached screenshot. Compare it with the successful module-generation and stub-generation examples; the work is done when the package's Python module produces a usable stub file.