treefile2prolog: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/lib/fastdnaml/bin/treefile2prolog - from package: fastdnaml

You may install the required package with command apt-get install {package}

Error in other languages:
treefile2prolog: bevel nie gevind nie
treefile2prolog: comandă negăsită
treefile2prolog: comando não encontrado
treefile2prolog: commande introuvable
treefile2prolog: command not found
treefile2prolog: käsku ei ole
treefile2prolog: không tìm thấy lệnh
treefile2prolog: komanda nerasta
treefile2prolog: Kommando nicht gefunden.
treefile2prolog: kommandot finns inte
treefile2prolog: komut yok
treefile2prolog: nie znaleziono polecenia
treefile2prolog: níor aimsíodh an t-ordú
treefile2prolog: no se encontró la orden
treefile2prolog: no s'ha trobat l'ordre
treefile2prolog: opdracht niet gevonden
treefile2prolog: parancs nem található
treefile2prolog: perintah tidak ditemukan
treefile2prolog: príkaz nenájdený
treefile2prolog: příkaz nenalezen
treefile2prolog: команда не найдена
treefile2prolog: командата не е открита
treefile2prolog: 命令找不到
treefile2prolog: コマンドが見つかりません