ktp-send-file: 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/ktp-send-file - from package: kde-telepathy-send-file

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

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