categories_file: 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/categories_file - from package: fastdnaml

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

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