MonitorWharf: 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/MonitorWharf - from package: afterstep

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

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