Error running as.phylo (package ape)

Hi all,

I  try to  convert hclust object to phylo object, using as.phylo (package 
ape), but got an error like the following:

tese<- read.table ("tese_guildas.txt", header=T)
library(mva)
library(ape)
hclust.tree<-hclust(dist(tese[1:156,]))
phylo.tree<- as.phylo(hclust.tree)
Segmentation fault (core dumped)

Can someone give me a hint where I migth be going wrong? Is there something I
forgot to do?

Best regards,

Rog?rio

[R Version: 1.8.0; Platform: Mandrake 9.2]