請問8大俠，收到移民局來信，不知道哪裏出錯，請指點，謝謝！

我申請的是婚姻綠卡，因為老公收入不夠，經濟擔保就讓我弟弟填了（弟弟的收入足夠），並已經收到打指紋的通知，現在收到移民局的來信，看了半天，不明白是哪裏錯了，請8大俠指點，來信如下：               Form i-846 Affidavit of Support was submitted;however,it was not from the petitioner/sponsor.

Submit a completed and signed Form i-846 for the petitioner/sponsor listed on Form i-130.Even if a joint sponsor will be used,the petitioner/sponsor must submit Form i-864.Also provide copies of the petitioner/sponsor's most recent Federal Iincom tax returns.

 非常感謝！