Error on check-out

Hi we have just installed solidworks and pdmw everything seems to work fine, I can connect to pdmw vaultadmin, and to vault itself in solidworks. Check-in works fine but when I try to check out I get this message

erreur lors de la recuperation de XXXX.sldprt sur le serveur

approximately :

eroor while checking out xxxx.sldprt on the serveur

Do you want to continue ?

Any advice ?

SolidworksWorkgroup Pdm