Virtex-4 FX12: Mini module board from avnet

Hi, I am using the virtx-4 mini module board from Avnet to implement some designs. Howeever I am not able to compile the reference design available along with the design on Xilinx EDK 7.1i. I had an error with the opb_ddr version. I found the answe on Xilinx site and corrected the version. Inspite of that, I have an error in the system.ucf file: Applying constraints in "system.ucf" to the design... ERROR:NgdBuild:756 - Line 27 in 'system.ucf': Could not find net(s) 'ddr_sdram_32mx16/ddr_sdram_32mx16/DDR_CTRL_I/ddr_dqs_rst<*>' in the design. To suppress this error specify the correct net name or remove the constraint. ERROR:NgdBuild:756 - Line 28 in 'system.ucf': Could not find net(s) 'ddr_sdram_32mx16/ddr_sdram_32mx16/DDR_CTRL_I/ddr_dqs_setrst<*>' in the design. To suppress this error specify the correct net name or remove the constraint. ERROR:Parsers:11 - Encountered unrecognized constraint while parsing. ERROR:NgdBuild:19 - Errors found while parsing constraint file "system.ucf".

Has anyone else had a similar problem?? Does anyone have a solution?? Thanks, Vivek