xpaset: 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/xpaset - from package: xpa

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

On Debian possible default full paths are:

/usr/bin/xpaset - from package: xpa-tools

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

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