[R-sig-ME] error on example

[Brent Pedersen]

Hi, I'm running this code:

library(lme4a)
data(ergoStool,package="MEMSS")
ergoStool$Subject <- factor(ergoStool$Subject)
fm01 <- lmer(effort~1 + Type + (1|Subject), ergoStool, REML=0)

And getting this error:

Error: is.numeric(u <- attr(fval, "u")) is not TRUE
Execution halted


My sessionInfo is below. Any ideas on how to fix this? I'm having
trouble calling
lmer() on any data.

thanks,
-Brent

R version 2.14.1 (2011-12-22)
Platform: x86_64-unknown-linux-gnu (64-bit)

locale:
[1] C

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

other attached packages:
[1] lme4a_0.9996875-1  MatrixModels_0.3-1 minqa_1.2.0        Rcpp_0.9.10
[5] Matrix_1.0-5       lattice_0.20-6

loaded via a namespace (and not attached):
[1] codetools_0.2-8 grid_2.14.1     nlme_3.1-103    splines_2.14.1