uuconv: 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/uuconv - from package: uucp

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

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