Erred' means to make a mistake or an error. It is the past tense of the verb 'ERR, ' which means to stray from what is right or proper. The term 'Proved to be Human' refers to the process of establishing that someone or something is indeed human. In this context, 'ERRED' would mean that the person or thing was initially thought to not be human, but after further investigation it was proven to be human.