What project was Das Ganu working on, and what difficulty did he encounter according to Chapter 20?

According to Chapter 20 of the Sai Satcharitra, Das Ganu was working on a commentary called the 'Ishavasya-Bhavartha-Bodhini.' His goal was to explain the meaning of the Ishavasya Upanishad in simple Prakrit language for those who did not know Sanskrit. However, he encountered a significant obstacle. Despite translating the text word for word, he felt unable to grasp its internal secret and deep meaning, which left his mind without joy. It was this doubt that prompted him to seek the guidance of Sai Baba in Shirdi.