I, you and he have committed a terrible mistake.

Explanation

When confessing a fault or mistake, the order of personal pronouns is 123 (First, Second, Third). The usage 'I, you and he' is correct here. No error in structure, but it usually reads 'I, you and he'. Wait, actually 'I, you and he' IS the correct format for confession. So 'No Error'. Let's mark A if it was an error, but wait, the answer is A if they think 231. In exam keys, 123 is correct for negative acts. So No Error. For MCQ let's make the error: 'He, you and I have committed...'