What project was Das Ganu working on, and what specific problem led him to seek Sai Baba's help in Shirdi?

Chapter 20 explains that Das Ganu was authoring a commentary called the 'Ishavasya-Bhavartha-Bodhini.' His goal was to make the profound meanings of the Ishavasya Upanishad accessible in simple language for those who were ignorant of Sanskrit. However, he encountered a significant problem: while he could translate the text word for word, he could not grasp the 'internal secret' or deep meaning, which left his mind unsatisfied. This doubt is what prompted him to go to Sai Baba in Shirdi for a resolution.