plasmaengineexplorer: 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/bin/plasmaengineexplorer - from package: kdebase-workspace

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

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