libee-convert: 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/sbin/libee-convert - from package: libee-utils

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

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