rstpep2html: 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/bin/rstpep2html - from package: python-docutils

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

Error in other languages:
rstpep2html: bevel nie gevind nie
rstpep2html: comandă negăsită
rstpep2html: comando não encontrado
rstpep2html: commande introuvable
rstpep2html: command not found
rstpep2html: käsku ei ole
rstpep2html: không tìm thấy lệnh
rstpep2html: komanda nerasta
rstpep2html: Kommando nicht gefunden.
rstpep2html: kommandot finns inte
rstpep2html: komut yok
rstpep2html: nie znaleziono polecenia
rstpep2html: níor aimsíodh an t-ordú
rstpep2html: no se encontró la orden
rstpep2html: no s'ha trobat l'ordre
rstpep2html: opdracht niet gevonden
rstpep2html: parancs nem található
rstpep2html: perintah tidak ditemukan
rstpep2html: príkaz nenájdený
rstpep2html: příkaz nenalezen
rstpep2html: команда не найдена
rstpep2html: командата не е открита
rstpep2html: 命令找不到
rstpep2html: コマンドが見つかりません