This happened several times on one of our users.
He is rendering from network drive. After a while it will happen.
When this happened it will make the network down. Shows yellow exclamation mark on network adapter.
When I disabled the network adapter and renable it, the network will comeback.
It's running fine on another computer.
That's a Quicktime error, which begs the question for exaxct system information, including what version of QT is on that machine and whether the qtserver32.exe is running properly. And of course some general info on the system will help, too, as will exact render settings information.
It also appears you are writing out to a network drive as well. That is not usually a good idea unless you are using image sequences.