What was the specific problem Das Ganu faced while working on the Ishavasya Upanishad, and what was Sai Baba's initial advice to him?

According to Chapter 20, Das Ganu was working on a commentary called "Ishavasya-Bhavartha-Bodhini," attempting to explain the meaning of the Ishavasya Upanishad in simple language for those unfamiliar with Sanskrit. Although he translated it word for word, he found no joy because he couldn't grasp the "internal secret" or deep meaning of the scripture. When this doubt arose, he traveled to Shirdi and presented his problem at the feet of Sai Baba. Baba's response was intriguing; as the chapter recounts, he told Das Ganu, "The resolution of this doubt of yours will be done by the maidservant at Kaka’s house when you return there."