Cite as: 513 U. S. 432 (1995)
Opinion of the Court
Moreover, precedent suggests that civil and criminal harmless-error standards do not differ in their treatment of grave doubt as to the harmlessness of errors affecting substantial rights. In Kotteakos, the Court interpreted the then-existing harmless-error statute, 28 U. S. C. § 391, now codified with minor change at 28 U. S. C. § 2111. See Kotteakos, 328 U. S., at 759 (explaining that the statute "grew out of widespread and deep conviction" that appellate courts had become " 'impregnable citadels of technicality' ") (citation omitted). That statute, by its terms, applied to both civil and criminal cases, and Kotteakos made no distinction, at least with respect to the question at issue here, between the two types of cases. See id., at 757, n. 9; 11 C. Wright & A. Miller, Federal Practice and Procedure § 2883, p. 276 (1973) (hereinafter Wright & Miller). Similarly, the current harmless-error statute "traces its lineage" to § 391, and applies in both civil and criminal proceedings. See McDonough Power Equipment, Inc. v. Greenwood, 464 U. S. 548, 554, n. 4 (1984). And, more important for present purposes, the current harmless-error sections of the Federal Rules of Civil Procedure and the Federal Rules of Criminal Procedure (which use nearly identical language) both refer to § 391 as their statutory source. Compare Fed. Rule Crim. Proc. 52(a) (providing that "[a]ny error . . . which does not affect substantial rights shall be disregarded") with Fed. Rule Civ. Proc. 61 (providing that the court "must disregard any error . . . which does not affect the substantial rights of the parties"); see Advisory Committee's Notes on Fed. Rule Crim. Proc. 52(a), 18 U. S. C. App., p. 833 (referring to former § 391 as a source); Advisory Committee's Notes on Fed. Rule Civ. Proc. 61, 28 U. S. C. App., p. 676 (same). In fact, in recent cases, we have interpreted the nearly identical language of Rule 52(a) as treating instances of grave doubt just as we treat them here. See Olano, 507 U. S., at 740-741, 743; Lane, 474 U. S., at 449 (quoting Kotteakos, supra, at 765).
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