flactag: 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/flactag - from package: flactag

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