txt2pes: 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/txt2pes - from package: opencaster

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

Error in other languages:
txt2pes: bevel nie gevind nie
txt2pes: comandă negăsită
txt2pes: comando não encontrado
txt2pes: commande introuvable
txt2pes: command not found
txt2pes: käsku ei ole
txt2pes: không tìm thấy lệnh
txt2pes: komanda nerasta
txt2pes: Kommando nicht gefunden.
txt2pes: kommandot finns inte
txt2pes: komut yok
txt2pes: nie znaleziono polecenia
txt2pes: níor aimsíodh an t-ordú
txt2pes: no se encontró la orden
txt2pes: no s'ha trobat l'ordre
txt2pes: opdracht niet gevonden
txt2pes: parancs nem található
txt2pes: perintah tidak ditemukan
txt2pes: príkaz nenájdený
txt2pes: příkaz nenalezen
txt2pes: команда не найдена
txt2pes: командата не е открита
txt2pes: 命令找不到
txt2pes: コマンドが見つかりません