What was the problem Das Ganu faced with the Ishavasya Upanishad, and what was Sai Baba's peculiar advice to him?

Das Ganu was working on a commentary called "Ishavasya-Bhavartha-Bodhini" to explain the deep meanings of the Ishavasya Upanishad in simple Prakrit language for people unfamiliar with Sanskrit. According to Chapter 20, although he had translated the scripture word for word, his mind found no joy because he could not grasp its "internal secret" or profound essence. When he brought this doubt to Sai Baba in Shirdi, Baba gave him the unusual advice that his doubt would be resolved by a maidservant at Kaka’s house when he returned there.