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

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

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