According to Chapter 20, what was Das Ganu attempting to write, what specific problem did he encounter, and what was Sai Baba's unusual advice?

Chapter 20 of the Sai Satcharitra recounts the story of Das Ganu, who had undertaken the project of writing the "Ishavasya-Bhavartha-Bodhini." His goal was to create a commentary explaining the meaning of the Ishavasya Upanishad in simple Prakrit language so it could be understood by those ignorant of Sanskrit. The problem he faced was that although he translated the text word for word, he could not grasp its deep internal secret, and therefore his mind found no joy in the work. When he presented this doubt to Sai Baba, the Satguru gave him a surprising instruction, stating, "The resolution of this doubt of yours will be done by the maidservant at Kaka’s house When you return there."