Xilinx Error Msg- Help Required

Hello Friends

I am getting following errors, Does any one know how to resolve this error.

Reading NGO file "C:/Project/StepImp/simpleQ/gen6/ xnodes/nodes.ngc" ... Reading component libraries for design expansion... Loading design module "C:\Project\StepImp\simpleQ\gen6\ xnodes/nodes.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

Rgd

Khan