Rooting trees using ape

Hi all,

I seem to be having a difficult time using the 'ape' package in R  
when it comes to rooting trees.  Here's a short screenshot:

[snip]

Can you post your dataset, or a subset of it that replicates
the problem, somewhere?  (On the list if short, otherwise
on some web site somewhere.)   [See "reproducible
example" in the posting guide.]

  cheers
    Ben Bolker

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