run_mappers: 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/run_mappers - from package: gasic

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

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