请问8大侠，收到移民局来信，不知道哪里出错，请指点，谢谢！

我申请的是婚姻绿卡，因为老公收入不够，经济担保就让我弟弟填了（弟弟的收入足够），并已经收到打指纹的通知，现在收到移民局的来信，看了半天，不明白是哪里错了，请8大侠指点，来信如下：               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.

 非常感谢！