Classes defined inside of another class generates a warning

[Thraka]

I get this warning for every member of a class defined in a class:

2019-03-04 11:19:06.8829|WARN|InheritDoc.Program|Could not find type 'NamespaceA.ClassA.ClassB'

namespace NamespaceA
{
    using System;

    /// <summary>
    /// Some docs
    /// </summary>
    public class ClassA
    {
        /// <summary>
        /// Some docs
        /// </summary>
        public class ClassB
        {
        }

    }
}