[R] error in gnls

[Christian Mora]

Dear R users;

I'm trying to fit nonlinear model (asymptotic regression model) with gnls
from library nlme in R 2.1.0 with no big issues so far. However after
installed the version R 2.1.1, when I tried to update the initial model
including a var-cov model I've got the error: "Error: Object "convIter" not
found". This error occurs only with R 2.1.1. Any ideas?

Thanks

Christian Mora