darkdashboard: 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 CentOS possible default full paths are:

/usr/sbin/darkdashboard - from package: darkserver-importer

You may install the required package with command yum install {package}

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