you made a mistake
Cometiste un error, pero no es grave.
You made a mistake, but it’s not serious.
Perhaps you made a mistake.
Maybe you made a mistake.
Ya que cometiste un error, reconócelo.
Since you made a mistake, admit it.
— Замри-умри-воскресни! (1990)
Francamente hablando, cometiste un error.
Frankly speaking, you made a mistake.
Cometiste un error al rechazar su ayuda.
You made a mistake by refusing their help.