chaptercheck: 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/chaptercheck - from package: dvdwizard

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

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