You have some other problem, but I'm not sure which ...
Are you by chance trying to move the VM to another datastore and to another host at the same time? Doing this with the VM powered on would be enhanced vMotion and that is available in 5.1 only. However, pure Storage vMotion (moving to another datastore while staying on the same host) should be possible online, and also multiple times even with eval licenses.
Another thought: Have you enabled vMotion on the host's VMkernel interface?
Just curious: Why are you starting with 5.0, and not with the current release 5.1?