I have found the objects with the ca's they are located in the node, right under the object material. It says Custom Attribute, but it's a missing CA class.
I tried to delete it
custAttributes.delete $ 1
It says ok, but it's still there. It's a class from a originally finalrender scene. I don't know how to get rid of it, and now the scene doesn't submit to backburner....
Any immediate help is greatly appreciated!