cvc3: 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/cvc3 - from package: cvc3

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

Error in other languages:
cvc3: bevel nie gevind nie
cvc3: comandă negăsită
cvc3: comando não encontrado
cvc3: commande introuvable
cvc3: command not found
cvc3: käsku ei ole
cvc3: không tìm thấy lệnh
cvc3: komanda nerasta
cvc3: Kommando nicht gefunden.
cvc3: kommandot finns inte
cvc3: komut yok
cvc3: nie znaleziono polecenia
cvc3: níor aimsíodh an t-ordú
cvc3: no se encontró la orden
cvc3: no s'ha trobat l'ordre
cvc3: opdracht niet gevonden
cvc3: parancs nem található
cvc3: perintah tidak ditemukan
cvc3: príkaz nenájdený
cvc3: příkaz nenalezen
cvc3: команда не найдена
cvc3: командата не е открита
cvc3: 命令找不到
cvc3: コマンドが見つかりません