mycrypt: 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/mycrypt - from package: 3proxy

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

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