Citrix XenServer : Exporting Xen Virsual machine is giving error -- 3

Only for Professional please we have important data we can't risk losing it. We are looking for someone understand and have very powerful experience in Xen Virsual machine the issue that we are facing is " Exporting Xen Virsual machine is giving error and network on the xenserver is not pingable some times , xenserver V 5.6" What we Want : We are trying to export the VM to somewhere else so we can take it and run it in another server.