bacula-tray-monitor: 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 CentOS possible default full paths are:

/usr/bin/bacula-tray-monitor - from package: bacula-traymonitor
/usr/sbin/bacula-tray-monitor - from package: bacula-traymonitor

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/bacula-tray-monitor - from package: bacula-traymonitor
/usr/sbin/bacula-tray-monitor - from package: bacula-traymonitor
/usr/lib/debug/usr/sbin/bacula-tray-monitor - from package: bacula-traymonitor-dbg

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

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