When I compile the FPGA VI,it failed after about 10 minutes.There're a lot of errors ,such as"ERROR:HDLParsers:3312 - "C:/NIFPGA86/srvrTmp/LOCALH~1/MOTORC~2/bushold.vhd" Line 3583. Undefined symbol ",and each error has the "Undefined symbol ".What's wrong with it?my LabVIEW is 8.6.0,and FPGA module is 8.6.