Can you describe the mistake Babasaheb Tarkhad made and how he reacted when he realized it?

Babasaheb Tarkhad's mistake, as recounted in Chapter 9, was that he forgot to offer the daily Naivedya of sugar candy to Sai Baba's photograph. Being the chief officer of a large mill, his mind was busy with business, causing this lapse. He only realized his error when he sat down to eat and noticed the cook hadn't served him the 'Prasad' (the offered sugar candy) as was the daily custom. His reaction was one of extreme remorse and guilt. He considered it not just a mistake but a "great sin" and was filled with repentance. With tearful eyes, he prostrated before Sai's image, begged for forgiveness, and felt so helpless that he immediately sent a letter to his son in Shirdi, asking him to plead with Sai for mercy on his behalf.