sendfiled: 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/sbin/sendfiled - from package: sendfile

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

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