エラーの検出 けんしゅつ訂正 ていせいではありませんでした
erāno kenshu tsuto teiseidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of エラーの検出と訂正

1. Was not error detection and correction.; Was not the detection and correction of errors.

Past/Perfective
Negative
Polite
Formal Register
Computing