[R] GLMM error message

[Matt Loveland]

Hi,

I wrote a few days ago about an error message I'm getting when I use GLMM
from lme4 to do random effects modelling.
When I add random effects, I get the following error message:   Error in
"EMsteps<-"(`*tmp*`, value = control) : invalid source matrix.

(I wanted to note that I've only just started to learn about random effects
modelling and R, so am a novice at both, but R/lme4 have been great up to
this hiccup)

I was asked to provide a reproducable example, so here is my try, using the
guImmun data frame included with the package:

library(lme4)
     data(guImmun)

 fm1 = GLMM(immun ~ kid2p + mom25p + momWork,
               data = guImmun, family = binomial,
               random = ~1|mom)

  fm2 = GLMM(immun ~ kid2p + mom25p + momWork,
               data = guImmun, family = binomial,
               random = ~kid2p|mom)
**
fm1 produces output, and fm2 gives me the following error message:

        Error in "EMsteps<-"(`*tmp*`, value = control) :
              invalid source matrix

Is my model statement incorrect?  Are there possible data problems I should
direct my attention to?
Any help will be appreciated.

I'm using R 1.8.1

thanks for any feedback,

Matt