tv_to_text: 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_to_text - from package: xmltv-util

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

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