77In the second place, as regards the criticism that the Commission is attempting by its appeal to amend or supplement the decision at issue as to the nature of the State aid it covered, it should be recalled that, in accordance with the case-law of the Court of Justice cited in paragraph 75 of this judgment, a ground of appeal must seek not the annulment of the decision challenged at first instance but rather to have the judgment under appeal set aside by advancing a line of argument specifically identifying the error of law allegedly vitiating that judgment, failing which it is inadmissible. Accordingly, an appellant is entitled to lodge an appeal relying on grounds which arise from the judgment under appeal itself and seek to criticise, in law, its correctness (judgment of 4 March 2021, Commission v Fútbol Club Barcelona, C‑362/19 P, EU:C:2021:169, paragraph 47 and the case-law cited).
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