Veeam replication issue

Hi all,

kindly assist me on this issue:

while I am trying to replicate virtual servers I get the following error on some of them:

7/24/2013 2:06:21 AM :: Error: Client error: NFC storage connection is unavailable. Storage: [stg:datastore-31,nfchost:host-29,conn:"V Center name"]. Storage display name: ["Data Store"].

Failed to create NFC download stream. NFC path: [nfc://conn:"V Center name",nfchost:host-29,stg:datastore-31@"Virtual Server name"/name.vmx].

Thank You