xml_sanitize: 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/plainbox-providers-1/checkbox/bin/xml_sanitize - from package: plainbox-provider-checkbox

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

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