xml_count: 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/xml_count - from package: sloccount

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

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