applet-coherence: 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/applet-coherence - from package: python-Coherence

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

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