wmmemload: 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 Debian possible default full paths are:

/usr/bin/wmmemload - from package: wmmemload

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

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