fslave1: 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/fslave1 - from package: pvm-examples

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

Error in other languages:
fslave1: bevel nie gevind nie
fslave1: comandă negăsită
fslave1: comando não encontrado
fslave1: commande introuvable
fslave1: command not found
fslave1: käsku ei ole
fslave1: không tìm thấy lệnh
fslave1: komanda nerasta
fslave1: Kommando nicht gefunden.
fslave1: kommandot finns inte
fslave1: komut yok
fslave1: nie znaleziono polecenia
fslave1: níor aimsíodh an t-ordú
fslave1: no se encontró la orden
fslave1: no s'ha trobat l'ordre
fslave1: opdracht niet gevonden
fslave1: parancs nem található
fslave1: perintah tidak ditemukan
fslave1: príkaz nenájdený
fslave1: příkaz nenalezen
fslave1: команда не найдена
fslave1: командата не е открита
fslave1: 命令找不到
fslave1: コマンドが見つかりません