dancer: 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/dancer - from package: libdancer-perl

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

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