Can you tell me about the book Das Ganu was writing in Chapter 20 and the specific problem he faced that brought him to Sai Baba?

In Chapter 20, we learn that Das Ganu was authoring a commentary called the "Ishavasya-Bhavartha-Bodhini." His noble intention was to explain the profound meaning of the Ishavasya Upanishad in simple Prakrit Ovi verses, making it accessible to those who were ignorant of the Sanskrit language. Despite successfully translating the text word for word, he encountered a significant problem: he could not grasp the deep, internal secret of the Upanishad. This lack of true understanding left his mind without joy or satisfaction, and this specific doubt is what prompted him to travel to Shirdi to seek guidance from his Satguru, Sai Baba.