ncftpspooler: 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 CentOS possible default full paths are:

/usr/bin/ncftpspooler - from package: ncftp

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/ncftpspooler - from package: ncftp

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

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