Problem extracting from mer objects

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Chris Ramsborg <ramsborg <at> yahoo.com> writes:

I am having a problem extracting from "mer" objects.? 
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I have constructed my problem using existing datasets.
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Using the following commands:
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require(lme4)
fm1 <- lmer(Yield ~ 1 + (1 | Batch), Dyestuff)
fixef(fm1)

I get the following error message:
"Error in UseMethod("fixef") : no applicable method for "fixef""
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[FWIW, questions on nlme/lmer might better be directed
to r-sig-mixed-models at lists.r-project.org]

  Do you have the nlme package loaded simultaneously
(you shouldn't) ?
  I can get almost (but not quite) the same error message
by doing the following:

require(lme4)

Loading required package: lme4
Loading required package: Matrix
Loading required package: lattice

fm1 <- lmer(Yield ~ 1 + (1 | Batch), Dyestuff)
fixef(fm1)

(Intercept) 
     1527.5

library(nlme)

Attaching package: 'nlme'


	The following object(s) are masked from package:lme4 :

	 BIC,
	 fixef,
	 lmList,
	 ranef,
	 VarCorr

fixef(fm1)

Error in UseMethod("fixef") : 
  no applicable method for 'fixef' applied to an object of class "mer"