Dear Liu Guangping, > I have executed your command.But it also has some errors.The error files is > attached as '0702error.txt'. The file contains warnings, but no errors. The warnings may be safely ignored. You should have a working "readgeneral" program in the directory in which you executed the command. Regards, Steve Emmerson Ticket Details =================== Ticket ID: PPR-301422 Department: Support UDUNITS Priority: Normal Status: Closed