convert-wsp-to-ceres: 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/convert-wsp-to-ceres - from package: python-ceres

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

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