Error while inheriting InferiorClasses attributes in classdef

Hello, I would like that my subclass B inherits the InferiorClasses attribute from its superclass A. But it throws the following error : 'InferiorClasses' must be a meta.class handle or a cell array of meta.class handles. I am not sure to understand what I am doing wrong. Thank you for your help.

classdef (InferiorClasses = meta.class.fromName('classA').InferiorClasses) classB < classA
    properties
    end

      methods
      end
  end

[Steven Lord]

Can you show classA's classdef line as well?