Hi all

After upgrading the R on my Mac to 3.1.1 (Mavericks), the lme4 package does
not function well. When I run the same script which works very well on
previous R version (R 2.), I got the error message that said "could not
find function "lmer""​.

I installed several packages I needed as usual:
>install.packages (c("rpart", "chron", "Hmisc", "Design", "Matrix", "lme4",
"coda", "e1071", "zipfR", "ape", "languageR"))

Then I run the following command every time:
library (LanguageR)

If I run "library (lme4)" every time, the lmer function seems work, but the
model output is weird. I have tried installing the old versions of R
(R3.0.0 - R3.1.0), but I got the same error message as well.

I am not very familiar with R-language. I wonder if anyone had this problem
before and find a solution to it? Thanks a lot!

Best,
Yingying

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