snmptthandler: 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/snmptthandler - from package: snmptt

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

On Debian possible default full paths are:

/usr/sbin/snmptthandler - from package: snmptt

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

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