In Chapter 20, what was the literary project Das Ganu was working on, and what specific problem did he encounter that led him to seek Sai Baba's help?

Chapter 20 explains that Das Ganu was writing a commentary called "Ishavasya-Bhavartha-Bodhini." His goal was to translate the deep meanings of the Ishavasya Upanishad into simple Prakrit Ovi verses for people who were ignorant of the Sanskrit language. While he successfully did a word-for-word translation, he felt that he had failed to grasp the "internal secret" or the profound, underlying essence of the scripture. This lack of true understanding left his mind without joy or satisfaction, and this doubt is what compelled him to travel to Shirdi to seek the guidance of his Satguru, Sai Baba.