plsense-worker-find: 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/plsense-worker-find - from package: plsense

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

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