What specific problem was Das Ganu facing with the Ishavasya Upanishad that led him to seek Sai Baba's help?

According to Chapter 20, Das Ganu was working on a commentary or explanation of the Ishavasya Upanishad, titled 'Ishavasya-Bhavartha-Bodhini,' intended to make its meaning accessible in simple Prakrit language for those who did not know Sanskrit. Although he had completed a word-for-word translation, he felt that he had failed to grasp the 'internal secret' or the deeper, profound meaning of the scripture. This lack of true understanding left his mind without joy, and it was this specific doubt and intellectual block that prompted him to travel to Shirdi to seek guidance from his Satguru, Sai Baba.