dwell-click-applet: 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/dwell-click-applet - from package: mousetweaks

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

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