treefile: 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/treefile - from package: fastdnaml

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

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