pmls: 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/pmls - from package: perl-pmtools

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

On Debian possible default full paths are:

/usr/bin/pmls - from package: pmtools

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

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