Wang2222
Based on your information provided, is it possible that you filed your case before a visa available for your case? I noticed that you have a PD as 04/99, RD as 04/00. I remember clearly that in Mar 2000, the visa was current, available for all PD EB2 cases. But on Apr 1, 2000, PD was back to 1997. So better check with your competent lawer to consider refiling your case. I saw some cases, filed two or three days ahead of the visa-avialable PD date, also got RFEs, but finally got denied, could not appeal. I noticed that they got suggestions to refile.
Hope this can help.