What was the specific problem Das Ganu faced while writing his commentary on the Ishavasya Upanishad, and what did Sai Baba tell him to do about it?

In Chapter 20, we learn that Das Ganu was composing a commentary on the Ishavasya Upanishad in simple Prakrit language, called the "Ishavasya-Bhavartha-Bodhini," to make it accessible to those who didn't know Sanskrit. His specific problem was that while he had translated the text word for word, he felt he had not grasped its "internal secret" or deeper meaning, and therefore his mind found no joy in the work. When a doubt arose, he took it to Sai Baba in Shirdi. In response, as recounted in Chapter 20, Baba did not give him a direct explanation but instead told him, "The resolution of this doubt of yours will be done by the maidservant at Kaka’s house when you return there."