check permissions on source means its a snapvault permissions issue.
do a options snapvault.access
it will tell you which host can communicate with snapvault.
I assume that youre trying to seed a baseline QSM for snapvault ? then F:\ is in your windows server usb drive? if yes, then: options snapvault.access host=yourwindowsserverHOST
then try your lrep_reader command.
btw check out some of my threads on lrep, I have struggled with it in my past, its very poorly documented tool, but useful nontheless.