This is clearly one of your nodes that can't find the source files referenced in your scene.
Unfortunately iToo has made it hard to maintain the links, as it often forces the default paths in your setup. You need to set it up buth in your project ini-files, your user paths in Max and in the registry - and even then it tend to f... it up.
If you have run an update of iToo software, you are back to square one again. I have complained to iToo about this matter, and they replied that they are currently working on a new installer that should keep your setup once it's set.
THe best you can do at the moment is to cehck your links in your asset browser - and ensure that it points to a common drive that all your nodes can see.