The previously reported ordered moment vector is one-fourth of the correct one. This Erratum was caused by the mistake in the scale factor. The correct ordered moment vector is [ 0.10 ( 5 ) , 2.41 ( 4 ) , - 1.42 ( 6 ) ] μ B . Its magnitude is 2.92 ( 7 ) μ B . The ellipse in the previous Fig. 7 indicates the second-shortest Cr-Cr pair (not the shortest pair). In the present Fig. 7, the shortest, second-shortest, and third-shortest Cr-Cr pairs are indicated by solid red, dotted green, and dashed blue lines, respectively. The exchange interaction is ferromagnetic in the shortest Cr-Cr pair ( 3.01 ). Probably, the dominant antiferromagnetic interaction exists in the second-shortest pair ( 4.97 ) or in the third-shortest pair ( 5.24 ). (Figure Presented). The authors thank V. Y. Pomjakushin for pointing out our errors.