What was the specific problem Das Ganu faced while working on the Ishavasya Upanishad that made him go to Sai Baba?

According to Chapter 20, Das Ganu had undertaken the task of creating a commentary, the 'Ishavasya-Bhavartha-Bodhini', to explain the meaning of the Ishavasya Upanishad in simple Prakrit language for those who didn't know Sanskrit. While he managed a word-for-word translation, he felt that he had not grasped the 'internal secret' or the deep, true meaning of the scripture. This lack of profound understanding meant that his 'mind found no joy' in the work, and a significant doubt arose, compelling him to seek the guidance of his Satguru, Sai Baba, in Shirdi.