The following error is reported in NGDBuild:
"ERROR:NgdBuild:765 - Line xx in '<file>.ucf': A parsing error has occurred while reading the constraint file. The value <X> at column <Y> is invalid."
To prevent this problem, ensure that the name listed in the constraints file or in the related EDIF file matches the top-level netlist file. Open the EDIF file with a text editor and search for the string that matches the UCF. All names between modules must match to prevent the NGDBuild error. The net names or bus delimiters might be the issue.