What specific problem did Das Ganu have while writing his commentary on the Ishavasya Upanishad, and how did Baba say it would be solved?

Chapter 20 of the Shri Sai Satcharitra explains the challenge Das Ganu faced while composing his commentary, the "Ishavasya-Bhavartha-Bodhini." His aim was to explain the Upanishad in simple Prakrit language for those who didn't know Sanskrit. However, the text states that while he translated it word-for-word, he could not grasp the "internal secret" or the deep meaning, and as a result, "the mind found no joy." When he took this doubt to Sai Baba in Shirdi, Baba provided a surprising solution. As recounted in Chapter 20, Baba told him, "The resolution of this doubt of yours will be done by the maidservant at Kaka’s house when you return there."