I read that Das Ganu was writing a book but got stuck. What was the book, and what did Sai Baba tell him to do about his problem?

According to Chapter 20, Das Ganu was undertaking a significant literary project: a commentary on the Ishavasya Upanishad titled "Ishavasya-Bhavartha-Bodhini." His goal was to translate and explain the deep meanings of this scripture in simple Prakrit language for those who did not know Sanskrit. However, he encountered a doubt and could not grasp the internal secret of the text, which left him dissatisfied. Seeking guidance, he took his doubt to Sai Baba in Shirdi. Baba offered a cryptic solution, stating, "The resolution of this doubt of yours will be done by the maidservant at Kaka’s house When you return there." This sets the stage for the story that follows.