ecaccess-association-delete: 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 Debian possible default full paths are:

/usr/bin/ecaccess-association-delete - from package: ecaccess

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

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