[R-sig-ME] lmer not working

[Georgina Brennan]

Dear list,

I am using the lme4 package on R studio (v.0.98.994)****. I haven't used 
it in a while but I have been regularly updating my packages.  Recently 
I attempted to run a simple mixed model:> 
lmer(mean.perDay~complexity+(1|regime),data) and I get the following 
error message:

Error in get(name, envir = asNamespace(pkg), inherits = FALSE) :
   object '.setDummyField' not found


My question is, has anyone else faced any difficulty using lmer and if 
so can you advise me on how to fix my problem?  I am a PC (windows 7) user.

Thanks,

Georgina

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