xwit: 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/xwit - from package: xwit

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

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