RNWSSleighWorker.sh: 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/RNWSSleighWorker.sh - from package: R-nws

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

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