tla: 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/tla - from package: tla

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