mk_phantom_3d: 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/mk_phantom_3d - from package: cmtk

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

Error in other languages:
mk_phantom_3d: bevel nie gevind nie
mk_phantom_3d: comandă negăsită
mk_phantom_3d: comando não encontrado
mk_phantom_3d: commande introuvable
mk_phantom_3d: command not found
mk_phantom_3d: käsku ei ole
mk_phantom_3d: không tìm thấy lệnh
mk_phantom_3d: komanda nerasta
mk_phantom_3d: Kommando nicht gefunden.
mk_phantom_3d: kommandot finns inte
mk_phantom_3d: komut yok
mk_phantom_3d: nie znaleziono polecenia
mk_phantom_3d: níor aimsíodh an t-ordú
mk_phantom_3d: no se encontró la orden
mk_phantom_3d: no s'ha trobat l'ordre
mk_phantom_3d: opdracht niet gevonden
mk_phantom_3d: parancs nem található
mk_phantom_3d: perintah tidak ditemukan
mk_phantom_3d: príkaz nenájdený
mk_phantom_3d: příkaz nenalezen
mk_phantom_3d: команда не найдена
mk_phantom_3d: командата не е открита
mk_phantom_3d: 命令找不到
mk_phantom_3d: コマンドが見つかりません