tightspark: 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/tightspark - from package: lightspark

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

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