Can you explain the challenge Das Ganu faced while working on the Ishavasya Upanishad and how Sai Baba proposed to solve it?

Chapter 20 of the Sai Satcharitra recounts the story of Das Ganu, who undertook the task of creating a commentary on the Ishavasya Upanishad in simple language. While he translated the text word for word, he found that he could not grasp the internal secret or deep meaning, and his mind found no joy. As Chapter 20 explains, when this doubt arose, he went to Shirdi to seek guidance from his Satguru. Sai Baba's proposed solution was quite unique; he told Das Ganu that the doubt would be resolved by the maidservant at Kaka’s house upon his return.