Your version of [comptage_suffixe_dna] must be updated. Please download the current version http://sidhome.free.fr/codes/comptage_arbre_suffixe.tar.gz.
What's new : Count the "n" nucleotides of a sequence in fasta format, using the suffix tree method. Available as source. Take care it's greedy in memory.
Thank you for using my softwares ;). Jerome.