fastDNAml_loop: 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/fastDNAml_loop - from package: fastdnaml

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

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