plot augPred

[Achaz Graf Von Hardenberg <achaz.von.hardenberg@usherbrooke.ca>]

Hi,
I am trying to plot the augmented predictions of some lme objects with the
following formula:
> plot(augPred(object.lme),aspect="xy",grid=T)

but I always get the following error message:

Error in tapply(as.character(object[[nm]]), gr..: "[[" is not a function
Warning messages:
  only the first of 3 elements used for string value in: stop(paste("\""
, farg, "\" is not a function", sep = ""))

I would be thankful to anybody who can help me sort this out!

Achaz von Hardenberg
Alpine Wildlife Research Centre
Gran Paradiso National Park, Italy