findmissingcrystal: 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/findmissingcrystal - from package: kdesdk

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

On Debian possible default full paths are:

/usr/bin/findmissingcrystal - from package: kdesdk-scripts

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

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