dasher: 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/dasher - from package: dasher

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

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