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

According to Chapter 20, Das Ganu was working on a commentary called the "Ishavasya-Bhavartha-Bodhini." His goal was to explain the deep meanings of the Ishavasya Upanishad in simple Prakrit language for those who were not proficient in Sanskrit. While he managed a word-for-word translation, he found himself unable to grasp the "internal secret" or the profound inner meaning of the scripture. This lack of deep understanding caused his mind to find no joy in the work, and this specific doubt prompted him to travel to Shirdi to seek guidance from his Satguru, Sai Baba.