PTtiff2psd: 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/PTtiff2psd - from package: libpano13-bin

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

Error in other languages:
PTtiff2psd: bevel nie gevind nie
PTtiff2psd: comandă negăsită
PTtiff2psd: comando não encontrado
PTtiff2psd: commande introuvable
PTtiff2psd: command not found
PTtiff2psd: käsku ei ole
PTtiff2psd: không tìm thấy lệnh
PTtiff2psd: komanda nerasta
PTtiff2psd: Kommando nicht gefunden.
PTtiff2psd: kommandot finns inte
PTtiff2psd: komut yok
PTtiff2psd: nie znaleziono polecenia
PTtiff2psd: níor aimsíodh an t-ordú
PTtiff2psd: no se encontró la orden
PTtiff2psd: no s'ha trobat l'ordre
PTtiff2psd: opdracht niet gevonden
PTtiff2psd: parancs nem található
PTtiff2psd: perintah tidak ditemukan
PTtiff2psd: príkaz nenájdený
PTtiff2psd: příkaz nenalezen
PTtiff2psd: команда не найдена
PTtiff2psd: командата не е открита
PTtiff2psd: 命令找不到
PTtiff2psd: コマンドが見つかりません