WatchFolderAndSend: 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/WatchFolderAndSend - from package: pixelmed-webstart-apps

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

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