tv_validate_grabber: 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/tv_validate_grabber - from package: xmltv-util

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

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