gnat2xml: 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/gnat2xml - from package: asis-programs

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

Error in other languages:
gnat2xml: bevel nie gevind nie
gnat2xml: comandă negăsită
gnat2xml: comando não encontrado
gnat2xml: commande introuvable
gnat2xml: command not found
gnat2xml: käsku ei ole
gnat2xml: không tìm thấy lệnh
gnat2xml: komanda nerasta
gnat2xml: Kommando nicht gefunden.
gnat2xml: kommandot finns inte
gnat2xml: komut yok
gnat2xml: nie znaleziono polecenia
gnat2xml: níor aimsíodh an t-ordú
gnat2xml: no se encontró la orden
gnat2xml: no s'ha trobat l'ordre
gnat2xml: opdracht niet gevonden
gnat2xml: parancs nem található
gnat2xml: perintah tidak ditemukan
gnat2xml: príkaz nenájdený
gnat2xml: příkaz nenalezen
gnat2xml: команда не найдена
gnat2xml: командата не е открита
gnat2xml: 命令找不到
gnat2xml: コマンドが見つかりません