cansend: 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/cansend - from package: can-utils

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

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