Release 5.2.03i - ngdbuild F.31
Copyright (c) 1995-2002 Xilinx, Inc.  All rights reserved.

Command Line: ngdbuild -quiet -dd c:\xilinx\projects\zerochecker/_ngo -i -p
xc2s50e-pq208-6 zerochecker.ngc zerochecker.ngd 

Reading NGO file "C:/Xilinx/projects/zerochecker/zerochecker.ngc" ...
Reading component libraries for design expansion...
Loading design module "C:\Xilinx\projects\zerochecker/zerochecker.ngc"...
FATAL_ERROR:NgdBuild:basnbmain.c:1910:1.71.4.1 - Design is empty.   Process will
   terminate.  To resolve this error, please consult the Answers Database and
   other online resources at http://support.xilinx.com. If you need further
   assistance, please open a Webcase by clicking on the "WebCase" link at
   http://support.xilinx.com
