nfacctd: 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/nfacctd - from package: pmacct

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

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