Rserve: 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/lib/R/bin/Rserve - from package: r-cran-rserve

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

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