lme4 1.0-4 now on CRAN

Hadley is correct.  Installing from source on R 3.0.0 windows works:

install.packages("lme4", repos = "http://cran.r-project.org", type = "source")

[snip compile info]

require(lme4)

[snip]

example(lmer)

lmer> ## linear mixed models - reference values from older code
lmer> (fm1 <- lmer(Reaction ~ Days + (Days | Subject), sleepstudy))
Linear mixed model fit by REML ['lmerMod']
Formula: Reaction ~ Days + (Days | Subject)
   Data: sleepstudy
REML criterion at convergence: 1743.628
Random effects:
 Groups   Name        Std.Dev. Corr
 Subject  (Intercept) 24.741
          Days         5.922   0.07
 Residual             25.592
Number of obs: 180, groups: Subject, 18
Fixed Effects:
(Intercept)         Days
     251.41        10.47

lmer> summary(fm1)# (with its own print method)
Linear mixed model fit by REML ['lmerMod']
Formula: Reaction ~ Days + (Days | Subject)
   Data: sleepstudy

REML criterion at convergence: 1743.628

Random effects:
 Groups   Name        Variance Std.Dev. Corr
 Subject  (Intercept) 612.10   24.741
          Days         35.07    5.922   0.07
 Residual             654.94   25.592
Number of obs: 180, groups: Subject, 18

Fixed effects:
            Estimate Std. Error t value
(Intercept)  251.405      6.825   36.84
Days          10.467      1.546    6.77

Correlation of Fixed Effects:
     (Intr)
Days -0.138

Has the output of

traceback()

after this error been posted?  If not, could you do so?

We had a similar problem with Shiny - some notes I had from a chat
Winston follow:

We seem to be getting a bug related to this for some people who are using Shiny
https://github.com/wch/r-source/commit/5c97cd443058434015670f0b7af4c2a86b732e89

setRefClass calls refClassInformation calls .makeDefaultBinding calls
.setDummyField
turns out the problem was that we were distributing a package built
under 3.0.1, and users who installed under 3.0.0 had problems with
something about .setDummyField
The solution seems to be to rebuild under 3.0.0 and distribute that


So it may not be a problem with the package source.

Hadley


--
Chief Scientist, RStudio
http://had.co.nz/

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Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://joshuawiley.com/
Senior Analyst - Elkhart Group Ltd.
http://elkhartgroup.com