solid-action-desktop-gen: 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/solid-action-desktop-gen - from package: kdebase-workspace

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

On Debian possible default full paths are:

/usr/bin/solid-action-desktop-gen - from package: kde-workspace-bin

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

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