ecaccess-event-clear: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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 Debian possible default full paths are:

/usr/bin/ecaccess-event-clear - from package: ecaccess

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