tv_extractinfo_ar: command not found

Have You tried accessing the binary with the full path?

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_extractinfo_ar - from package: xmltv-util

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