I have the latest update 11.0.2. (Saw same issue with version 11.0.0)
Got the error yesterday from my render computers. Had to render on one machine.
The next day I was able to use the render farm without any issues at all.
But then the next time I rendered, same day, merely changing colors on a layer, I get the error message again.
Same project file each time. Why does it work sometimes but not other times???
How can this be remedied?
I have not seen this error in all my years of using AE. I have not made any changes to my computers except regular Windows updates. Last version we couldn't network at all, now there are errors while trying to network render.
I think I found "my" problem. I don't know if other will solve this issue the same.
It turns out that a certain .AVI file rendered from Cineform Studio will not work in a network render, onl yin the stand alone AE software.
I rendered that .AVI out from AE as a .AVI and now I don't get the error. So apparently, the Cineform format won't work on a network render.
By the way, that might be a really good feature request!