pmerr: 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/pmerr - from package: pcp

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

On Debian possible default full paths are:

/usr/bin/pmerr - from package: pcp

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

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