snmpttconvertmib: 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/snmpttconvertmib - from package: snmptt

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

On Debian possible default full paths are:

/usr/sbin/snmpttconvertmib - from package: snmptt

You may install the required package with command apt-get install {package}

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