Error when using models with lmer

Hello,

I am executing the following code

library("lme4")
library(faraway)
data(penicillin)
fit4 <- lmer(yield ~ treat + (1|blend), penicillin)
and the lines below generate error messages

library(gmodels)
ci(fit4)
Yes.  Why would you want to try to create a vector from an S4 fitted
model object?

It almost never makes sense to use

c(foo)

Most of the time when people use that idiom what they really mean is

foo

(I say "almost never" because in the old days many of us would use
c(myMatrix) to create a vector from a matrix.  The preferred form is
now as.vector(myMatrix).)
Error in as.vector(data) :
?no method for coercing this S4 class to a vector

contrast.function <- c(0, -1, 0, 0)
test.result <- estimable(fit4, contrast.function)
Error in as.vector(data) :
I assume that the "estimable" function is in the gmodels package, so
you should contact the author of that package about this.
?no method for coercing this S4 class to a vector

This worked with with lme4_0.999375-40 and R version 2.13.1, but not with lme4_0.999375-42 and R version 2.14.1.

Would you have suggestions on how to make this work?
Thank you in advance
Olga Vitek

sessionInfo()
R version 2.14.1 (2011-12-22)
Platform: i386-apple-darwin9.8.0/i386 (32-bit)

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats ? ? graphics ?grDevices utils ? ? datasets ?methods ? base

other attached packages:
[1] gmodels_2.15.1 ? faraway_1.0.5 ? ?lme4_0.999375-42 Matrix_1.0-3 ? ? lattice_0.20-0

loaded via a namespace (and not attached):
[1] gdata_2.8.2 ? grid_2.14.1 ? gtools_2.6.2 ?MASS_7.3-16 ? nlme_3.1-102 ?stats4_2.14.1 tools_2.14.1
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Error when using models with lmer

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