Did anybody ever get this kind of message from uscis?

I just got a email notice from USCIS as following copy, did anybody ever get this kind of message before? I thought I submit everything they need. What possiblly they need? Puzzled.Please help to let me know. Thanks
*********************************
On December 3, 2009, we mailed a notice requesting additional evidence or information in this case N400 APPLICATION FOR NATURALIZATION. Please follow the instructions on the notice to submit the requested information. This case will be in suspense until we receive the evidence or the opportunity to submit it expires. Once we receive the requested evidence or information and make a decision on the case, you will be notified by mail. If you move while this case is pending, please use our Change of Address online tool to update your case with your new address or call our customer service center at 1-800-375-5283.

If you have questions or concerns about your application or the case status results listed above, or if you have not received a decision from USCIS within the current processing time listed*, please contact USCIS Customer Service at [phone].

所有跟帖： 

• 回複：Did anybody ever get this kind of message from uscis? -Lian_Ti_Yin_Er- ♂ (35 bytes) () 12/04/2009 postreply 09:41:02

• 回複：回複：Did anybody ever get this kind of message from uscis? -Lian_Ti_Yin_Er- ♂ (62 bytes) () 12/04/2009 postreply 09:46:42

• Thanks for your answer. -ChinaPeony- ♀ (0 bytes) () 12/04/2009 postreply 09:51:22