WOMACK, J., delivered the opinion for a unanimous Court.

This case presents a question of the authority of courts to reverse a conviction on appeal on the ground that a juror was absolutely disqualified.

The term "absolutely disqualified" is derived from the catchline of Article 35.19 of the Code of Criminal Procedure:

Art. 35.19. Absolute disqualification No juror shall be impaneled when it appears that he is subject to the second, third or fourth cause of challenge in Article 35.16, though both parties may consent.

Those reasons for challenges for cause, as enumerated in Article 35.16(a), are:

2. That he has been convicted of theft or any felony;

3. That he is under indictment or other legal accusation for theft or any felony;

4. That he is insane.

Article 35.16(a) also contains this paragraph:

No juror shall be impaneled when it appears that he is subject to the second, third or fourth cause of challenge set forth above, although both parties may consent. All other grounds for challenge may be waived by the party or parties in whose favor such grounds of challenge exist.

In this case, a member of the jury array volunteered the information about his absolute disqualification. He was Number 19 in a panel of 65 potential jurors who came to the district court. After six hours of voir dire examination, and as the court was hearing and ruling on challenges for cause at the bench, Number 19 asked if he could approach. He told the court, "I was not honest in swearing in this morning. When I was 17 I was convicted of misdemeanor theft. . . . I got an hour in jail and a fine. . . . I'm 61 years old, I was 17 then."

The judge said, "I think the problem is that that makes him disqualified, even a Class C Theft, if you paid a fine." After Number 19 assured the court that he had paid a fine, the judge said, "I think that disqualified him. We can go back and look at the statute. If y'all disagree as a matter of disqualification."

The defense attorney said, "We have a record of him, we checked it."

The court offered, "If you all want, I'll check the statute. If it disqualifies him, it disqualifies him." The judge consulted the Government Code and the Code of Criminal Procedure — in particular, Article 35.16. According to the judge, that statute meant that "if neither of you challenge he may stay on the jury."

The prosecutor advised the judge to "go down another section or two." After some off-the-record discussions, the court recessed for five minutes.

After the recess, the court told Number 19, "In answer to your question, there is a special Article which says — and is not with the others, it's all by itself — it says that someone who has a theft conviction may not be impaneled unless both parties consent. So that's where we are now.

"Does the State consent to impaneling [Number 19]?

The State had "no objection, if the defense has no objection." The prosecutor did ask Number 19 if he could be a fair juror to both sides, and Number 19 said that he could.

The defense attorney said, "I have no objection, Your Honor."

The court ruled, "Right now, you're still on the jury." Neither party challenged Number 19 for cause or peremptorily, and he served on the jury that found the appellant guilty of capital murder.

All now agree that the parties' consent would not permit Number 19 to be seated. The trial court may have misread Article 35.19 or the similar paragraph in Article 35.16(a) to permit the service of an absolutely disqualified juror when both parties consent, rather reading it correctly to forbid such service even though both parties consent.

After the trial court sentenced the appellant to imprisonment for life as Code of Criminal Procedure article 37.071, section 1 requires when the State has not sought the death penalty, this appeal followed.

The Seventh Court of Appeals reversed the judgment of conviction. It held that the ground of the juror's disqualification was preserved for review.

As a general rule, in order to preserve a complaint for review on appeal, the claimed error must have been presented in the trial court thereby providing the trial court the opportunity to correct any error during the course of the trial. See Tex.R.App.P. 33.1(a); Norris v. State, 902 S.W.2d 428, 446 (Tex. Cr. App. 1995), cert. denied, 516 U.S. 890 (1995). Here, however, the record demonstrates that the prospective juror's disqualification was raised in the trial court before the jury was selected which disclosure prompted considerable discussion, research, and consideration by the trial court. Also, counsels' discussion with the trial judge regarding the disqualification covers approximately ten pages of the reporter's record. From the information provided by the prospective juror of his theft conviction, the trial court concluded that the juror was disqualified, but notwithstanding the constitutional implications, proceeded to mistakenly impanel him concluding that the disqualification could be waived. Moreover, this contention is analogous to a sufficiency of the evidence challenge, see generally Givens v. State, 26 S.W.3d 739, 740 (Tex. App.-Austin 2000, pet. ref'd); Flanary v. State, 166 Tex.Crim. 495, 316 S.W.2d 897, 898 (1958), or error based on an ex post facto claim. See generally Ieppert v. State, 908 S.W.2d 217 (Tex. Cr. App. 1995) (holding that an ex post facto claim may be presented for the first time on appeal because a categorical prohibition may not be waived). See also Blue v. State, 41 S.W.3d 129,131 (Tex. Cr. App. 2000).

Turning to the question, "Is Error Reversible?" the court said:

The State contends that error, if any, was harmless and that under article 44.46 of the Code of Criminal Procedure, appellant's conviction cannot be reversed on the ground that an absolutely disqualified person was impaneled on the jury. We disagree. Following the decision in Thomas v. State, 796 S.W.2d 196, 199 (Tex. Cr. App. 1990), article 44.46 was added to Chapter 44, entitled "Appeal and Writ of Error." Without amending or modifying articles 35.16 or 35.19, article 44.46 addresses the reversal of conviction where an absolutely disqualified person serves on a jury. Under article 44.46(1), a conviction is reversible without a showing of harm if the defendant "raised" the disqualification before the verdict was entered; however, under (2) where the disqualification is not discovered or brought to the attention of the trial court until after the verdict is entered, the conviction is not reversible absent a showing of significant harm. However, because the disqualification could not be waived, see paragraph 11 of article 35.16, and the error occurred when the trial court did not sua sponte excuse the disqualified juror during the jury formation as required by Green v. State, 764 S.W.2d 242, 246 (Tex. Cr. App. 1989), articles 44.46(1) and (2) are not applicable. See also Pogue v. State, 553 S.W.2d 368, 370 (Tex. Cr. App. 1977) (holding that where the trial court is on notice of error in seating the panel before the jury is sworn, and the error is not corrected, automatic reversal is required.)

The question of the absolute disqualification of juror number 19 was first brought to the attention of the trial court during voir dire when juror number 19 told the judge that he had not been "honest in swearing in" and that he had a prior conviction. As shown by our review of the relevant portion of the discussion in the reporter's record, before the jury was impaneled, the disqualification of the juror was discussed at a bench conference. While the question was being considered by the court, on one occasion, as defense counsel handed a book to the trial judge, he suggested that instead of "excuses" the issue was "disqualification." Even if applicable, article 44.46(1) does not require that the issue be "raised" in a specific manner. Moreover, substantial compliance with requirements of the Code of Criminal Procedure is sufficient. See Bennett v. State, 394 S.W.2d 804, 807(Tex. Cr. App. 1965); Aspilla v. State, 952 S.W.2d 610, 612-13 (Tex. App.-Houston [14th Dist.] 1997, no pet.). Considering defense counsel's participation in conference with the judge and prosecutor, the law of substantial compliance and the axiom that the law does not require the doing of a "useless thing," Williams v. State, 549 S.W.2d 734, 737 (Tex. Cr. App. 1977), we conclude that for purposes of article 44.46(1), the defense "raised" the issue of juror disqualification before the verdict was entered.

The court of appeals also held that the error required reversal without consideration of harm, or that if a harm analysis were required, the error in seating the juror was harmful. We granted review.

We disagree with the court of appeals' reasoning in several respects: One was its conclusion that, "because the disqualification could not be waived, see paragraph 11 of article 35.16, and the error occurred when the trial court did not sua sponte excuse the disqualified juror during the jury formation . . . articles [ sic] 44.46(1) and (2) were not applicable." Article 44.46 applies to all cases of absolute disqualification.

Article 44.46, entitled "Reversal of Conviction on the Basis of Service by a Disqualified Juror" provides:

A conviction in a criminal case may be reversed on appeal on the ground that [a juror]in the case was absolutely disqualified from service under Article 35.19 of this code only if:

(1) the defendant raises the disqualification before the verdict is entered; or

(2) the disqualification was not discovered or brought to the attention of the trial court until after the verdict was entered and the defendant makes a showing of significant harm by the service of the disqualified juror.

The article applies only to absolute disqualifications (those that could not be "waived" or, more precisely, consented to) and when the trial court fails to disqualify the absolutely disqualified juror on its own motion.

If either party challenged such a juror for cause, the trial court's ruling on the challenge would be the basis of the appeal. There would be no occasion for Article 44.46 to apply.

The error in the court of appeals' reasoning is highlighted by its citation, " See also Pogue v. State, 553 S.W.2d 368, 370 (Tex. Cr. App. 1977) (holding that where the trial court is on notice of error in seating the panel before the jury is sworn, and the error is not corrected, automatic reversal is required.)" This is the kind of holding that Article 44.46 would prevent.

Also a matter of concern is the court of appeals' holding, "Even if applicable, article 44.46(1) does not require that the issue be `raised' in a specific manner." The statute specifies one important, specific manner in which the issue must be raised in order for Article 44.46(1) to apply: the defendant raises the disqualification before the verdict is entered.

Another troubling point about the court of appeals' analysis was related to the second; it assumed that the usual rules for preservation of error applied, and it omitted an essential part of even those usual rules. The usual rule for preservation of error for appeal is Rule of Appellate Procedure 33.1(a), which the court of appeals cited. But it overlooked the first requirement of the rule, which is that "a complaint was made to the trial court by . . . request, objection, or motion." The appellant made no complaint to the trial court. (As we have said, if a challenge to Number 19 had been made, this would be a different case.) In fact he did the opposite; he said that he had no objection.

Article 44.46 is different from the usual rules of error preservation. As we have said, it affects cases in which the parties have not challenged jurors for cause as they are required to do. The statute limits the authority of a court to reverse a conviction on appeal on the ground of an absolutely disqualified juror to two kinds of cases, in which "(1) the defendant raises the disqualification before the verdict is entered; or (2) the disqualification was not discovered or brought to the attention of the trial court until after the verdict was entered and the defendant makes a showing of significant harm by the service of the disqualified juror." The clauses are significantly different.

Before the enactment of the statute, this court had inferred from Articles 35.16(a) and 35.19 that the seating of an absolutely disqualified juror always called for reversal even when a defendant first raised the question in a motion for new trial. Clause (2) puts a burden on the defendant to meet a new standard of harm in such cases, when the disqualification is raised after the entry of the verdict. In this clause it makes no difference who discovers the disqualification or how it is brought to the attention of the trial court; that portion of the clause is in the passive voice. A duty on the defendant arises in an appeal to make a showing of significant harm. A defendant may have his conviction reversed on appeal, even though he did nothing before the verdict was entered, but only if he meets a high standard that Article 44.46(2) raises on appeal. Presumably some defendants who once could have obtained reversals on appeal merely by showing a disqualification in a motion for new trial now will not obtain reversals because they will not be able to meet the burden to show significant harm. Thus the defendant is discouraged from waiting until after the verdict to begin thinking about the problem of a disqualified juror. The evident purpose of this clause is to deal with the defendant who did not learn, but could have learned, before the verdict that a juror was absolutely disqualified.

Clause (1), which is in the active voice, puts a duty on the defendant to raise a disqualification before the verdict is entered. If a defendant takes that action, he may obtain a reversal on appeal without carrying a high burden to show harm. This encourages a defendant not only to start thinking about disqualified jurors before the verdict is entered, but to raise the disqualification if he learns of it before verdict. The evident purpose of this clause is to deal with the defendant who could have raised, but did not raise, the issue. This comports with the purposes of rules for error-preservation, which "promote the prevention and correction of errors. When valid objections are timely made and sustained, the parties may have a lawful trial. They, and the judicial system, are not burdened by appeal and retrial. When a party is excused from the requirement of objecting, the results are the opposite." Whether this purpose or some other moved the legislature to enact Article 44.46 we do not know, and we need not know in order to apply the unambiguous wording of that statute.

This appellant could have raised, but did not raise, the disqualification before the verdict was entered. He actually did the opposite of raising the issue by telling the court that he had no objection to the disqualified juror. We cannot hold, as the court of appeals did, that the defendant's failure to raise the issue was of no consequence so long as someone raised it. His failure to raise the issue means this judgment of conviction may not be reversed under Article 44.46.

For these reasons there is no occasion for us to address the court of appeals' holdings on the issue of harm.

The judgment of the court of appeals is reversed, and the appeal is remanded to that court so that it may consider the appellant's other points of error.