DashCast: 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/DashCast - from package: gpac

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