isotprecv: 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/isotprecv - from package: can-utils

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

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