mcv-int64: 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/mcv-int64 - from package: scotch

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

Error in other languages:
mcv-int64: bevel nie gevind nie
mcv-int64: comandă negăsită
mcv-int64: comando não encontrado
mcv-int64: commande introuvable
mcv-int64: command not found
mcv-int64: käsku ei ole
mcv-int64: không tìm thấy lệnh
mcv-int64: komanda nerasta
mcv-int64: Kommando nicht gefunden.
mcv-int64: kommandot finns inte
mcv-int64: komut yok
mcv-int64: nie znaleziono polecenia
mcv-int64: níor aimsíodh an t-ordú
mcv-int64: no se encontró la orden
mcv-int64: no s'ha trobat l'ordre
mcv-int64: opdracht niet gevonden
mcv-int64: parancs nem található
mcv-int64: perintah tidak ditemukan
mcv-int64: príkaz nenájdený
mcv-int64: příkaz nenalezen
mcv-int64: команда не найдена
mcv-int64: командата не е открита
mcv-int64: 命令找不到
mcv-int64: コマンドが見つかりません