What was the specific problem Das Ganu faced with his literary project, and what was Sai Baba's unusual advice to him?

According to Chapter 20, Das Ganu was working on a commentary of the Ishavasya Upanishad, which he titled the "Ishavasya-Bhavartha-Bodhini." His goal was to translate the deep meanings of the scripture into simple Prakrit language. However, he encountered a significant problem: although he had translated the text word for word, he felt he was missing the "internal secret" or deeper essence, and his mind found no joy in the work. When he brought this doubt to Sai Baba in Shirdi, Baba gave him the curious instruction, "The resolution of this doubt of yours will be done by the maidservant at Kaka’s house When you return there."