RSleighService.py: 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/share/R/library/nws/bin/RSleighService.py - from package: R-nws

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

On Debian possible default full paths are:

/usr/lib/R/site-library/nws/bin/RSleighService.py - from package: r-cran-nws

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

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