msgexec: 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/msgexec - from package: gettext

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

On Debian possible default full paths are:

/usr/bin/msgexec - from package: gettext

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

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