pmlc: 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/pmlc - from package: pcp

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

On Debian possible default full paths are:

/usr/bin/pmlc - from package: pcp

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

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