open_jtalk: 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/open_jtalk - from package: open-jtalk

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

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