Describe the mistake Babasaheb Tarkhad made while his son was away and his immediate reaction to it.

While his son was in Shirdi, Babasaheb Tarkhad made the mistake of forgetting to offer the daily Naivedya. As Chapter 9 recounts, Tarkhad, who was the chief officer of a large mill, became preoccupied with his business and missed offering the piece of sugar candy during the morning worship. He only realized his oversight later in the day when he sat down for his meal and the offered 'Prasad' was not served. His reaction was one of intense remorse and repentance. He was filled with grief, bowed to Sai's image with tearful eyes, and considered the mistake a "great sin." He felt utterly helpless and immediately sent a letter to his son, imploring him to ask for Sai Baba's forgiveness on his behalf.