AL HAJJ — Ayat 12

يَدْعُو مِن دُونِ اللَّهِ مَا لَا يَضُرُّهُ وَمَا لَا يَنفَعُهُ ذَلِكَ هُوَ الضَّلَالُ الْبَعِيدُ

He invokes instead of Allah that which neither harms him nor benefits him. That is what is the extreme error.