Can any one help me to solve the below error in R (ape)?

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Jose Sergio Hleap

in the estimation, the lower bound could be too small (e.g. negative), making the phylogenetic variance covariance non-positive semidefinite singular. tru to use the bound option (bounds = list(a=c(X,> 0))), with X being the loest bound you are willing to accept. Also, check this thread... http://permalink.gmane.org/gmane.comp.lang.r.phylo/2376

Aram Jaf

thank you Stephan Kühnel and Jose Sergio Hleap for your help and suggestions.