R: do not have nlme() and lmer() packages simultaneously loaded

I noticed when I was trying to display the summary of an lmer object using display() from the arm() package, I was getting this error:

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

And I found from this post that you should not simultaneously have the nlme() and lmer() packages loaded. To detach a package, for instance, nlme(), you can do this (see R FAQ 5.2):

 detach("package:nlme") 
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