unwarp_image_phantom: 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/lib/cmtk/bin/unwarp_image_phantom - from package: cmtk

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

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