I am having a similar problem. I've looked through various messages asking about this issue with standard Archicad library objects, but haven't found any of the suggested solutions to work.
I am using the Archicad 11 student version on a Mac Powerbook G4, but had the same problem before I upgraded from Archicad 10 EDU.
The specific line at which the fill error occurs varies from object to object. What is consistent is that in the object default settings dialogue, under parameters/3D representation, some of the fills are identified as (MISSING). When I try to change the fill, the error messages still pop up.
In version 10, SOMETIMES (but not always) I could make the problem go away by changing to a different fill. However, now that I am using 11, when I try to change the fill, the only available alternatives are: % 100; marker fill; Empty_Fill-International; and Standing Seam. None of these make the errors go away.
Obviously if I could solve this by changing the fills object by object, I would be happy. But best would be if there was some way to fix all of the library objects at once.
Is this a problem that others have solved?
Thanks...