the mistake
Where was the mistake?
El error más mínimo podría conducir a un desastre fatal.
The slightest mistake could lead to a fatal disaster.
Este es el error del estudiante.
This is the student's mistake.
Where did the error appear?
Es el error que traen a las lecciones.
That's the mistake they bring to the lessons.
— El hombre de la tierra (2007)
Casi cometí el error número tres.
I almost made mistake number three.