The following error is reported in NGDBuild:
"ERROR:NgdBuild:756 - Line xx in '<file>.ucf': Could not find net(s) '<X>' in the design. To suppress this error, specify the correct net name or remove the constraint."
To prevent getting this error message, ensure that the name listed in the constraints file or in the related EDIF file matches the top-level netlist file name. The net name listed in the UCF or lower-level EDIF module must match exactly. Open the netlists and UCF to confirm that the net names are the same. Check the spelling and bus delimiters.