hamster-time-tracker: 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/hamster-time-tracker - from package: hamster-applet

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

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