sap router renew problem

hello guru's

at the tyme of renewing my sap router certificate when i execute the following command in cmd C:\usr\sap\saprouter>sapgenpse get_pse -v -r certreq1 -p local.pse "Distuinguished name"

i get an error "huh? i found 1 trailing unrecognised parameter on command line! ?

please reply asap since expiry date is very close .

Thanks in advanced.