nxt_filer: 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/bin/nxt_filer - from package: python-nxt-filer

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

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