opjitconv: 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/opjitconv - from package: oprofile

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

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